Release df00335103

__init__.py

@@ -55,8 +55,6 @@ class property_cache_pickle(object):
                 * **data_version():** returns a version number of the current data (it should be increased, if the get method of the source instance returns improved values or the data structure had been changed).
                 * **get(key, default):** returns the property for a key. If key does not exists, default will be returned.
     
-    .. hint:: You are able to use all parameters and methods of the `source_instance` identically with the property_cache instance.
-
     :param source_instance: The source instance holding the data
     :type source_instance: instance
     :param cache_filename: File name, where the properties are stored as cache
@@ -143,7 +141,7 @@ class property_cache_pickle(object):
         :param default: value to be returned, if key does not exists.
         :returns: value for a given key or default value.
         """
-        if key in self.keys() and key not in self._source_get_keys:
+        if key in self._source_instance.keys() and key not in self._source_get_keys:
             if self._cached_props is None:
                 self._init_cache()
             if self._max_age is None:
@@ -167,7 +165,7 @@ class property_cache_pickle(object):
                 logger.debug("Providing property for '%s' from cache", key)
             return self._cached_props[self.DATA_TAG].get(self._key_filter(key), default)
         else:
-            if key not in self.keys():
+            if key not in self._source_instance.keys():
                 logger.debug("Key '%s' is not in cached_keys. Uncached data will be returned.", key)
             elif key in self._source_get_keys:
                 logger.debug("Key '%s' is excluded by .add_source_get_keys(). Uncached data will be returned.", key)
@@ -229,8 +227,8 @@ class property_cache_pickle(object):
     def _load_source(self, sleep_between_keys=0):
         if self._cached_props is None:
             self._init_cache()
-        logger.debug('Loading all data from source - %s', repr(self.keys()))
-        for key in self.keys():
+        logger.debug('Loading all data from source - %s', repr(self._source_instance.keys()))
+        for key in self._source_instance.keys():
             if key not in self._source_get_keys:
                 self._cached_props[self.DATA_TAG][self._key_filter(key)] = self._source_instance.get(key)
                 self._cached_props[self.AGE_TAG][self._key_filter(key)] = int(time.time())
@@ -249,12 +247,6 @@ class property_cache_pickle(object):
         else:
             return self._cached_props.get(self.UID_TAG, None)
 
-    def __getattribute__(self, name):
-        try:
-            return super().__getattribute__(name)
-        except AttributeError:
-            return getattr(self._source_instance, name)
-
 
 class property_cache_json(property_cache_pickle):
     """

_docs_/index.html

@@ -238,6 +238,15 @@
         <span class="bp">self</span><span class="o">.</span><span class="n">print_n_sleep</span><span class="p">(</span><span class="s2">&quot;__five__&quot;</span><span class="p">)</span>
         <span class="k">return</span> <span class="s1">&#39;five&#39;</span>
 
+<span class="k">class</span> <span class="nc">test_slow_data_cached</span><span class="p">(</span><span class="n">test_slow_data</span><span class="p">):</span>
+    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kc">None</span><span class="p">:</span>
+        <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
+        <span class="bp">self</span><span class="o">.</span><span class="n">_cache</span> <span class="o">=</span> <span class="n">caching</span><span class="o">.</span><span class="n">property_cache_json</span><span class="p">(</span><span class="n">test_slow_data</span><span class="p">(),</span> <span class="s1">&#39;cache.json&#39;</span><span class="p">)</span>
+        <span class="bp">self</span><span class="o">.</span><span class="n">_cache</span><span class="o">.</span><span class="n">add_source_get_keys</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">KEY_THREE</span><span class="p">)</span>
+
+    <span class="k">def</span> <span class="nf">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
+        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cache</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="n">default</span><span class="p">)</span>
+
 
 <span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s2">&quot;__main__&quot;</span><span class="p">:</span>
     <span class="c1"># Logging configuration</span>
@@ -248,8 +257,7 @@
     <span class="p">)</span>
     <span class="c1"># Example</span>
     <span class="n">tm</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span>
-    <span class="n">data</span> <span class="o">=</span> <span class="n">caching</span><span class="o">.</span><span class="n">property_cache_json</span><span class="p">(</span><span class="n">test_slow_data</span><span class="p">(),</span> <span class="s1">&#39;cache.json&#39;</span><span class="p">)</span>
-    <span class="n">data</span><span class="o">.</span><span class="n">add_source_get_keys</span><span class="p">(</span><span class="n">data</span><span class="o">.</span><span class="n">KEY_THREE</span><span class="p">)</span>
+    <span class="n">data</span> <span class="o">=</span> <span class="n">test_slow_data_cached</span><span class="p">()</span>
     <span class="nb">print</span><span class="p">(</span><span class="s1">&#39;Testing property_cache (json):</span><span class="se">\n</span><span class="s1">--------------------------------&#39;</span><span class="p">)</span>
     <span class="k">for</span> <span class="n">key</span> <span class="ow">in</span> <span class="n">data</span><span class="o">.</span><span class="n">keys</span><span class="p">():</span>
         <span class="nb">print</span><span class="p">(</span><span class="n">data</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">key</span><span class="p">))</span>
@@ -260,30 +268,30 @@
 <p>Will result on the first execution to the following output (with a long execution time):</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Testing</span> <span class="n">property_cache</span> <span class="p">(</span><span class="n">json</span><span class="p">):</span>
 <span class="o">--------------------------------</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">43</span><span class="p">,</span><span class="mi">744</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Cache</span> <span class="n">file</span> <span class="n">does</span> <span class="ow">not</span> <span class="n">exists</span> <span class="p">(</span><span class="n">yet</span><span class="p">)</span><span class="o">.</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">43</span><span class="p">,</span><span class="mi">745</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">43</span><span class="p">,</span><span class="mi">745</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="n">key</span><span class="o">=</span><span class="s1">&#39;1&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">08</span><span class="p">,</span><span class="mi">845</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Cache</span> <span class="n">file</span> <span class="n">does</span> <span class="ow">not</span> <span class="n">exists</span> <span class="p">(</span><span class="n">yet</span><span class="p">)</span><span class="o">.</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">08</span><span class="p">,</span><span class="mi">846</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">08</span><span class="p">,</span><span class="mi">846</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="n">key</span><span class="o">=</span><span class="s1">&#39;1&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span>
 <span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="n">__1__</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">46</span><span class="p">,</span><span class="mi">746</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Adding</span> <span class="n">key</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">one</span> <span class="k">with</span> <span class="n">timestamp</span><span class="o">=</span><span class="mi">1726956166</span> <span class="n">to</span> <span class="n">chache</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">46</span><span class="p">,</span><span class="mi">747</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">11</span><span class="p">,</span><span class="mi">847</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Adding</span> <span class="n">key</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">one</span> <span class="k">with</span> <span class="n">timestamp</span><span class="o">=</span><span class="mi">1726995671</span> <span class="n">to</span> <span class="n">chache</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">11</span><span class="p">,</span><span class="mi">847</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
 <span class="n">one</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">46</span><span class="p">,</span><span class="mi">748</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="n">key</span><span class="o">=</span><span class="s1">&#39;2&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">11</span><span class="p">,</span><span class="mi">848</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="n">key</span><span class="o">=</span><span class="s1">&#39;2&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span>
 <span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="n">__2__</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">49</span><span class="p">,</span><span class="mi">749</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Adding</span> <span class="n">key</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">two</span> <span class="k">with</span> <span class="n">timestamp</span><span class="o">=</span><span class="mi">1726956169</span> <span class="n">to</span> <span class="n">chache</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">49</span><span class="p">,</span><span class="mi">750</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">14</span><span class="p">,</span><span class="mi">849</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Adding</span> <span class="n">key</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">two</span> <span class="k">with</span> <span class="n">timestamp</span><span class="o">=</span><span class="mi">1726995674</span> <span class="n">to</span> <span class="n">chache</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">14</span><span class="p">,</span><span class="mi">850</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
 <span class="n">two</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">49</span><span class="p">,</span><span class="mi">751</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Key</span> <span class="s1">&#39;three&#39;</span> <span class="ow">is</span> <span class="n">excluded</span> <span class="n">by</span> <span class="o">.</span><span class="n">add_source_get_keys</span><span class="p">()</span><span class="o">.</span> <span class="n">Uncached</span> <span class="n">data</span> <span class="n">will</span> <span class="n">be</span> <span class="n">returned</span><span class="o">.</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">14</span><span class="p">,</span><span class="mi">850</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Key</span> <span class="s1">&#39;three&#39;</span> <span class="ow">is</span> <span class="n">excluded</span> <span class="n">by</span> <span class="o">.</span><span class="n">add_source_get_keys</span><span class="p">()</span><span class="o">.</span> <span class="n">Uncached</span> <span class="n">data</span> <span class="n">will</span> <span class="n">be</span> <span class="n">returned</span><span class="o">.</span>
 <span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="n">__three__</span>
 <span class="n">three</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">52</span><span class="p">,</span><span class="mi">752</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="n">key</span><span class="o">=</span><span class="s1">&#39;four&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">17</span><span class="p">,</span><span class="mi">851</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="n">key</span><span class="o">=</span><span class="s1">&#39;four&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span>
 <span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="n">__four__</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">55</span><span class="p">,</span><span class="mi">754</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Adding</span> <span class="n">key</span><span class="o">=</span><span class="n">four</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">four</span> <span class="k">with</span> <span class="n">timestamp</span><span class="o">=</span><span class="mi">1726956175</span> <span class="n">to</span> <span class="n">chache</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">55</span><span class="p">,</span><span class="mi">755</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">20</span><span class="p">,</span><span class="mi">851</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Adding</span> <span class="n">key</span><span class="o">=</span><span class="n">four</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">four</span> <span class="k">with</span> <span class="n">timestamp</span><span class="o">=</span><span class="mi">1726995680</span> <span class="n">to</span> <span class="n">chache</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">20</span><span class="p">,</span><span class="mi">853</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
 <span class="n">four</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">55</span><span class="p">,</span><span class="mi">755</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="n">key</span><span class="o">=</span><span class="s1">&#39;five&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">20</span><span class="p">,</span><span class="mi">854</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="n">key</span><span class="o">=</span><span class="s1">&#39;five&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span>
 <span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="n">__five__</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">58</span><span class="p">,</span><span class="mi">757</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Adding</span> <span class="n">key</span><span class="o">=</span><span class="n">five</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">five</span> <span class="k">with</span> <span class="n">timestamp</span><span class="o">=</span><span class="mi">1726956178</span> <span class="n">to</span> <span class="n">chache</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">58</span><span class="p">,</span><span class="mi">758</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">23</span><span class="p">,</span><span class="mi">854</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Adding</span> <span class="n">key</span><span class="o">=</span><span class="n">five</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">five</span> <span class="k">with</span> <span class="n">timestamp</span><span class="o">=</span><span class="mi">1726995683</span> <span class="n">to</span> <span class="n">chache</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">23</span><span class="p">,</span><span class="mi">855</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
 <span class="n">five</span>
 <span class="o">--------------------------------</span>
 <span class="n">The</span> <span class="n">execution</span> <span class="n">time</span> <span class="n">was</span> <span class="mf">15.0</span><span class="n">s</span>
@@ -292,17 +300,17 @@
 <p>With every following execution the time cosumption my by much smaller:</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Testing</span> <span class="n">property_cache</span> <span class="p">(</span><span class="n">json</span><span class="p">):</span>
 <span class="o">--------------------------------</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">58</span><span class="p">,</span><span class="mi">825</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="n">properties</span> <span class="kn">from</span> <span class="nn">cache</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">58</span><span class="p">,</span><span class="mi">825</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;1&#39;</span> <span class="kn">from</span> <span class="nn">cache</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">23</span><span class="p">,</span><span class="mi">983</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="n">properties</span> <span class="kn">from</span> <span class="nn">cache</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">23</span><span class="p">,</span><span class="mi">984</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;1&#39;</span> <span class="kn">from</span> <span class="nn">cache</span>
 <span class="n">one</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">58</span><span class="p">,</span><span class="mi">825</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;2&#39;</span> <span class="kn">from</span> <span class="nn">cache</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">23</span><span class="p">,</span><span class="mi">984</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;2&#39;</span> <span class="kn">from</span> <span class="nn">cache</span>
 <span class="n">two</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">02</span><span class="p">:</span><span class="mi">58</span><span class="p">,</span><span class="mi">825</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Key</span> <span class="s1">&#39;three&#39;</span> <span class="ow">is</span> <span class="n">excluded</span> <span class="n">by</span> <span class="o">.</span><span class="n">add_source_get_keys</span><span class="p">()</span><span class="o">.</span> <span class="n">Uncached</span> <span class="n">data</span> <span class="n">will</span> <span class="n">be</span> <span class="n">returned</span><span class="o">.</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">23</span><span class="p">,</span><span class="mi">984</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Key</span> <span class="s1">&#39;three&#39;</span> <span class="ow">is</span> <span class="n">excluded</span> <span class="n">by</span> <span class="o">.</span><span class="n">add_source_get_keys</span><span class="p">()</span><span class="o">.</span> <span class="n">Uncached</span> <span class="n">data</span> <span class="n">will</span> <span class="n">be</span> <span class="n">returned</span><span class="o">.</span>
 <span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="n">__three__</span>
 <span class="n">three</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">01</span><span class="p">,</span><span class="mi">827</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;four&#39;</span> <span class="kn">from</span> <span class="nn">cache</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">26</span><span class="p">,</span><span class="mi">984</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;four&#39;</span> <span class="kn">from</span> <span class="nn">cache</span>
 <span class="n">four</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">01</span><span class="p">,</span><span class="mi">827</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;five&#39;</span> <span class="kn">from</span> <span class="nn">cache</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">26</span><span class="p">,</span><span class="mi">985</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;five&#39;</span> <span class="kn">from</span> <span class="nn">cache</span>
 <span class="n">five</span>
 <span class="o">--------------------------------</span>
 <span class="n">The</span> <span class="n">execution</span> <span class="n">time</span> <span class="n">was</span> <span class="mf">3.0</span><span class="n">s</span>
@@ -324,10 +332,6 @@ if the conditions for the cache usage are given.</p>
 <li><p><strong>get(key, default):</strong> returns the property for a key. If key does not exists, default will be returned.</p></li>
 </ul>
 </div>
-<div class="admonition hint">
-<p class="admonition-title">Hint</p>
-<p>You are able to use all parameters and methods of the <cite>source_instance</cite> identically with the property_cache instance.</p>
-</div>
 <dl class="field-list simple">
 <dt class="field-odd">Parameters<span class="colon">:</span></dt>
 <dd class="field-odd"><ul class="simple">
@@ -409,6 +413,15 @@ if the conditions for the cache usage are given.</p>
         <span class="bp">self</span><span class="o">.</span><span class="n">print_n_sleep</span><span class="p">(</span><span class="s2">&quot;__five__&quot;</span><span class="p">)</span>
         <span class="k">return</span> <span class="s1">&#39;five&#39;</span>
 
+<span class="k">class</span> <span class="nc">test_slow_data_cached</span><span class="p">(</span><span class="n">test_slow_data</span><span class="p">):</span>
+    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kc">None</span><span class="p">:</span>
+        <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
+        <span class="bp">self</span><span class="o">.</span><span class="n">_cache</span> <span class="o">=</span> <span class="n">caching</span><span class="o">.</span><span class="n">property_cache_json</span><span class="p">(</span><span class="n">test_slow_data</span><span class="p">(),</span> <span class="s1">&#39;cache.pickle&#39;</span><span class="p">)</span>
+        <span class="bp">self</span><span class="o">.</span><span class="n">_cache</span><span class="o">.</span><span class="n">add_source_get_keys</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">KEY_THREE</span><span class="p">)</span>
+
+    <span class="k">def</span> <span class="nf">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
+        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cache</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="n">default</span><span class="p">)</span>
+
 
 <span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s2">&quot;__main__&quot;</span><span class="p">:</span>
     <span class="c1"># Logging configuration</span>
@@ -419,8 +432,7 @@ if the conditions for the cache usage are given.</p>
     <span class="p">)</span>
     <span class="c1"># Example</span>
     <span class="n">tm</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span>
-    <span class="n">data</span> <span class="o">=</span> <span class="n">caching</span><span class="o">.</span><span class="n">property_cache_json</span><span class="p">(</span><span class="n">test_slow_data</span><span class="p">(),</span> <span class="s1">&#39;cache.json&#39;</span><span class="p">)</span>
-    <span class="n">data</span><span class="o">.</span><span class="n">add_source_get_keys</span><span class="p">(</span><span class="n">data</span><span class="o">.</span><span class="n">KEY_THREE</span><span class="p">)</span>
+    <span class="n">data</span> <span class="o">=</span> <span class="n">test_slow_data_cached</span><span class="p">()</span>
     <span class="nb">print</span><span class="p">(</span><span class="s1">&#39;Testing property_cache (pickle):</span><span class="se">\n</span><span class="s1">--------------------------------&#39;</span><span class="p">)</span>
     <span class="k">for</span> <span class="n">key</span> <span class="ow">in</span> <span class="n">data</span><span class="o">.</span><span class="n">keys</span><span class="p">():</span>
         <span class="nb">print</span><span class="p">(</span><span class="n">data</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">key</span><span class="p">))</span>
@@ -430,30 +442,30 @@ if the conditions for the cache usage are given.</p>
 <p>Will result on the first execution to the following output (with a long execution time):</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Testing</span> <span class="n">property_cache</span> <span class="p">(</span><span class="n">pickle</span><span class="p">):</span>
 <span class="o">--------------------------------</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">01</span><span class="p">,</span><span class="mi">889</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Cache</span> <span class="n">file</span> <span class="n">does</span> <span class="ow">not</span> <span class="n">exists</span> <span class="p">(</span><span class="n">yet</span><span class="p">)</span><span class="o">.</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">01</span><span class="p">,</span><span class="mi">890</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">01</span><span class="p">,</span><span class="mi">890</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="n">key</span><span class="o">=</span><span class="s1">&#39;1&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">27</span><span class="p">,</span><span class="mi">126</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Cache</span> <span class="n">file</span> <span class="n">does</span> <span class="ow">not</span> <span class="n">exists</span> <span class="p">(</span><span class="n">yet</span><span class="p">)</span><span class="o">.</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">27</span><span class="p">,</span><span class="mi">127</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">pickle</span><span class="p">)</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">27</span><span class="p">,</span><span class="mi">127</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="n">key</span><span class="o">=</span><span class="s1">&#39;1&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span>
 <span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="n">__1__</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">04</span><span class="p">,</span><span class="mi">891</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Adding</span> <span class="n">key</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">one</span> <span class="k">with</span> <span class="n">timestamp</span><span class="o">=</span><span class="mi">1726956184</span> <span class="n">to</span> <span class="n">chache</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">04</span><span class="p">,</span><span class="mi">891</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">30</span><span class="p">,</span><span class="mi">128</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Adding</span> <span class="n">key</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">one</span> <span class="k">with</span> <span class="n">timestamp</span><span class="o">=</span><span class="mi">1726995690</span> <span class="n">to</span> <span class="n">chache</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">30</span><span class="p">,</span><span class="mi">129</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">pickle</span><span class="p">)</span>
 <span class="n">one</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">04</span><span class="p">,</span><span class="mi">892</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="n">key</span><span class="o">=</span><span class="s1">&#39;2&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">30</span><span class="p">,</span><span class="mi">129</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="n">key</span><span class="o">=</span><span class="s1">&#39;2&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span>
 <span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="n">__2__</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">07</span><span class="p">,</span><span class="mi">892</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Adding</span> <span class="n">key</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">two</span> <span class="k">with</span> <span class="n">timestamp</span><span class="o">=</span><span class="mi">1726956187</span> <span class="n">to</span> <span class="n">chache</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">07</span><span class="p">,</span><span class="mi">893</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">33</span><span class="p">,</span><span class="mi">130</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Adding</span> <span class="n">key</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">two</span> <span class="k">with</span> <span class="n">timestamp</span><span class="o">=</span><span class="mi">1726995693</span> <span class="n">to</span> <span class="n">chache</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">33</span><span class="p">,</span><span class="mi">131</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">pickle</span><span class="p">)</span>
 <span class="n">two</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">07</span><span class="p">,</span><span class="mi">894</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Key</span> <span class="s1">&#39;three&#39;</span> <span class="ow">is</span> <span class="n">excluded</span> <span class="n">by</span> <span class="o">.</span><span class="n">add_source_get_keys</span><span class="p">()</span><span class="o">.</span> <span class="n">Uncached</span> <span class="n">data</span> <span class="n">will</span> <span class="n">be</span> <span class="n">returned</span><span class="o">.</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">33</span><span class="p">,</span><span class="mi">132</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Key</span> <span class="s1">&#39;three&#39;</span> <span class="ow">is</span> <span class="n">excluded</span> <span class="n">by</span> <span class="o">.</span><span class="n">add_source_get_keys</span><span class="p">()</span><span class="o">.</span> <span class="n">Uncached</span> <span class="n">data</span> <span class="n">will</span> <span class="n">be</span> <span class="n">returned</span><span class="o">.</span>
 <span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="n">__three__</span>
 <span class="n">three</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">10</span><span class="p">,</span><span class="mi">894</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="n">key</span><span class="o">=</span><span class="s1">&#39;four&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">36</span><span class="p">,</span><span class="mi">133</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="n">key</span><span class="o">=</span><span class="s1">&#39;four&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span>
 <span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="n">__four__</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">13</span><span class="p">,</span><span class="mi">895</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Adding</span> <span class="n">key</span><span class="o">=</span><span class="n">four</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">four</span> <span class="k">with</span> <span class="n">timestamp</span><span class="o">=</span><span class="mi">1726956193</span> <span class="n">to</span> <span class="n">chache</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">13</span><span class="p">,</span><span class="mi">896</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">39</span><span class="p">,</span><span class="mi">134</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Adding</span> <span class="n">key</span><span class="o">=</span><span class="n">four</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">four</span> <span class="k">with</span> <span class="n">timestamp</span><span class="o">=</span><span class="mi">1726995699</span> <span class="n">to</span> <span class="n">chache</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">39</span><span class="p">,</span><span class="mi">135</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">pickle</span><span class="p">)</span>
 <span class="n">four</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">13</span><span class="p">,</span><span class="mi">897</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="n">key</span><span class="o">=</span><span class="s1">&#39;five&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">39</span><span class="p">,</span><span class="mi">136</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="n">key</span><span class="o">=</span><span class="s1">&#39;five&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span>
 <span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="n">__five__</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">16</span><span class="p">,</span><span class="mi">898</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Adding</span> <span class="n">key</span><span class="o">=</span><span class="n">five</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">five</span> <span class="k">with</span> <span class="n">timestamp</span><span class="o">=</span><span class="mi">1726956196</span> <span class="n">to</span> <span class="n">chache</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">16</span><span class="p">,</span><span class="mi">899</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">42</span><span class="p">,</span><span class="mi">136</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Adding</span> <span class="n">key</span><span class="o">=</span><span class="n">five</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">five</span> <span class="k">with</span> <span class="n">timestamp</span><span class="o">=</span><span class="mi">1726995702</span> <span class="n">to</span> <span class="n">chache</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">42</span><span class="p">,</span><span class="mi">137</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">pickle</span><span class="p">)</span>
 <span class="n">five</span>
 <span class="o">--------------------------------</span>
 <span class="n">The</span> <span class="n">execution</span> <span class="n">time</span> <span class="n">was</span> <span class="mf">15.0</span><span class="n">s</span>
@@ -462,17 +474,17 @@ if the conditions for the cache usage are given.</p>
 <p>With every following execution the time cosumption my by much smaller:</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Testing</span> <span class="n">property_cache</span> <span class="p">(</span><span class="n">pickle</span><span class="p">):</span>
 <span class="o">--------------------------------</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">16</span><span class="p">,</span><span class="mi">978</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="n">properties</span> <span class="kn">from</span> <span class="nn">cache</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">16</span><span class="p">,</span><span class="mi">978</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;1&#39;</span> <span class="kn">from</span> <span class="nn">cache</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">42</span><span class="p">,</span><span class="mi">204</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Loading</span> <span class="n">properties</span> <span class="kn">from</span> <span class="nn">cache</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">pickle</span><span class="p">)</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">42</span><span class="p">,</span><span class="mi">204</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;1&#39;</span> <span class="kn">from</span> <span class="nn">cache</span>
 <span class="n">one</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">16</span><span class="p">,</span><span class="mi">978</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;2&#39;</span> <span class="kn">from</span> <span class="nn">cache</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">42</span><span class="p">,</span><span class="mi">205</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;2&#39;</span> <span class="kn">from</span> <span class="nn">cache</span>
 <span class="n">two</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">16</span><span class="p">,</span><span class="mi">979</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Key</span> <span class="s1">&#39;three&#39;</span> <span class="ow">is</span> <span class="n">excluded</span> <span class="n">by</span> <span class="o">.</span><span class="n">add_source_get_keys</span><span class="p">()</span><span class="o">.</span> <span class="n">Uncached</span> <span class="n">data</span> <span class="n">will</span> <span class="n">be</span> <span class="n">returned</span><span class="o">.</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">42</span><span class="p">,</span><span class="mi">205</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Key</span> <span class="s1">&#39;three&#39;</span> <span class="ow">is</span> <span class="n">excluded</span> <span class="n">by</span> <span class="o">.</span><span class="n">add_source_get_keys</span><span class="p">()</span><span class="o">.</span> <span class="n">Uncached</span> <span class="n">data</span> <span class="n">will</span> <span class="n">be</span> <span class="n">returned</span><span class="o">.</span>
 <span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="n">__three__</span>
 <span class="n">three</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">19</span><span class="p">,</span><span class="mi">980</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;four&#39;</span> <span class="kn">from</span> <span class="nn">cache</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">45</span><span class="p">,</span><span class="mi">205</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;four&#39;</span> <span class="kn">from</span> <span class="nn">cache</span>
 <span class="n">four</span>
-<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">00</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">19</span><span class="p">,</span><span class="mi">981</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;five&#39;</span> <span class="kn">from</span> <span class="nn">cache</span>
+<span class="mi">2024</span><span class="o">-</span><span class="mi">09</span><span class="o">-</span><span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">01</span><span class="p">:</span><span class="mi">45</span><span class="p">,</span><span class="mi">206</span><span class="p">:</span>    <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">caching</span> <span class="o">-</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;five&#39;</span> <span class="kn">from</span> <span class="nn">cache</span>
 <span class="n">five</span>
 <span class="o">--------------------------------</span>
 <span class="n">The</span> <span class="n">execution</span> <span class="n">time</span> <span class="n">was</span> <span class="mf">3.0</span><span class="n">s</span>

_examples_/property_cache_json.py

@@ -55,6 +55,15 @@ class test_slow_data(object):
         self.print_n_sleep("__five__")
         return 'five'
 
+class test_slow_data_cached(test_slow_data):
+    def __init__(self, *args, **kwargs) -> None:
+        super().__init__(*args, **kwargs)
+        self._cache = caching.property_cache_json(test_slow_data(), 'cache.json')
+        self._cache.add_source_get_keys(self.KEY_THREE)
+
+    def get(self, key, default=None):
+        return self._cache.get(key, default)
+
 
 if __name__ == "__main__":
     # Logging configuration
@@ -65,8 +74,7 @@ if __name__ == "__main__":
     )
     # Example
     tm = time.time()
-    data = caching.property_cache_json(test_slow_data(), 'cache.json')
-    data.add_source_get_keys(data.KEY_THREE)
+    data = test_slow_data_cached()
     print('Testing property_cache (json):\n--------------------------------')
     for key in data.keys():
         print(data.get(key))

_examples_/property_cache_pickle.py

@@ -55,6 +55,15 @@ class test_slow_data(object):
         self.print_n_sleep("__five__")
         return 'five'
 
+class test_slow_data_cached(test_slow_data):
+    def __init__(self, *args, **kwargs) -> None:
+        super().__init__(*args, **kwargs)
+        self._cache = caching.property_cache_json(test_slow_data(), 'cache.pickle')
+        self._cache.add_source_get_keys(self.KEY_THREE)
+
+    def get(self, key, default=None):
+        return self._cache.get(key, default)
+
 
 if __name__ == "__main__":
     # Logging configuration
@@ -65,8 +74,7 @@ if __name__ == "__main__":
     )
     # Example
     tm = time.time()
-    data = caching.property_cache_json(test_slow_data(), 'cache.json')
-    data.add_source_get_keys(data.KEY_THREE)
+    data = test_slow_data_cached()
     print('Testing property_cache (pickle):\n--------------------------------')
     for key in data.keys():
         print(data.get(key))