http://code.activestate.com/recipes/tags/functions-attributes-callback/2017-04-20T23:34:50-07:00ActiveState Code Recipes2017-04-20T23:34:50-07:00Vasudev Ramhttp://code.activestate.com/recipes/users/4173351/http://code.activestate.com/recipes/580788-implementing-class-based-callbacks-in-python/

<p style="color: grey"> Python recipe 580788 by <a href="/recipes/users/4173351/">Vasudev Ram</a> (<a href="/recipes/tags/callbacks/">callbacks</a>, <a href="/recipes/tags/classes/">classes</a>, <a href="/recipes/tags/functions/">functions</a>, <a href="/recipes/tags/methods/">methods</a>, <a href="/recipes/tags/objects/">objects</a>, <a href="/recipes/tags/programming/">programming</a>, <a href="/recipes/tags/python/">python</a>). </p> <p>This is a follow-on to this recently posted recipe:</p> <p>Implementing function-based callbacks in Python: <a href="https://code.activestate.com/recipes/580787-implementing-function-based-callbacks-in-python/?in=user-4173351" rel="nofollow">https://code.activestate.com/recipes/580787-implementing-function-based-callbacks-in-python/?in=user-4173351</a></p> <p>This new recipe shows how to create and use callbacks in Python, using classes with methods, instead of plain functions, as was done in the recipe linked above. All other points such as reasons and benefits for using callbacks, are more or less the same as mentioned in the previous recipe, except that class instances can carry state around, so to that extent, the two approaches are different.</p> <p><a href="https://jugad2.blogspot.in/2017/04/python-callbacks-using-classes-and.html" rel="nofollow">https://jugad2.blogspot.in/2017/04/python-callbacks-using-classes-and.html</a></p>

2017-01-30T14:09:47-08:00Vasudev Ramhttp://code.activestate.com/recipes/users/4173351/http://code.activestate.com/recipes/580753-find-the-arity-of-a-python-function/

<p style="color: grey"> Python recipe 580753 by <a href="/recipes/users/4173351/">Vasudev Ram</a> (<a href="/recipes/tags/functions/">functions</a>, <a href="/recipes/tags/introspection/">introspection</a>, <a href="/recipes/tags/python/">python</a>, <a href="/recipes/tags/python2/">python2</a>, <a href="/recipes/tags/reflection/">reflection</a>). </p> <p>This recipe shows how to find the arity of a given Python function. The arity of a function is the number of arguments the function takes. The recipe uses the inspect module of Python.</p> <p>More details and sample output (including some limitations) here:</p> <p><a href="https://jugad2.blogspot.in/2017/01/finding-arity-of-python-function.html" rel="nofollow">https://jugad2.blogspot.in/2017/01/finding-arity-of-python-function.html</a></p>

2011-08-12T23:06:57-07:00Eric Snowhttp://code.activestate.com/recipes/users/4177816/http://code.activestate.com/recipes/577786-smarter-default-arguments/

<p style="color: grey"> Python recipe 577786 by <a href="/recipes/users/4177816/">Eric Snow</a> (<a href="/recipes/tags/default_arguments/">default_arguments</a>, <a href="/recipes/tags/deferred/">deferred</a>, <a href="/recipes/tags/function/">function</a>, <a href="/recipes/tags/functions/">functions</a>). Revision 3. </p> <p>Improved handling of mutable and deferred default arguments. After the recipe you'll find an explanation of what that means.</p> <p>Works for 2.7 with minor tweaks (getfullargspec --> getargspec).</p>

2011-10-05T18:38:43-07:00Eric Snowhttp://code.activestate.com/recipes/users/4177816/http://code.activestate.com/recipes/577822-turn-a-function-into-a-class/

<p style="color: grey"> Python recipe 577822 by <a href="/recipes/users/4177816/">Eric Snow</a> (<a href="/recipes/tags/classes/">classes</a>, <a href="/recipes/tags/functions/">functions</a>). </p> <p>The only catch is that the function has to return locals() at the end. And it doesn't do the __prepare__ part of 3.x metaclasses.</p>

2011-07-18T15:11:51-07:00Dominic Innocenthttp://code.activestate.com/recipes/users/4178543/http://code.activestate.com/recipes/577799-batting-ball/

<p style="color: grey"> Python recipe 577799 by <a href="/recipes/users/4178543/">Dominic Innocent</a> (<a href="/recipes/tags/functions/">functions</a>, <a href="/recipes/tags/simple/">simple</a>). </p> <p>Have fun batting a ball about a room &amp; sometimes getting funny results.</p>

2011-01-24T18:40:51-08:00Kevin L. Sitzehttp://code.activestate.com/recipes/users/4173535/http://code.activestate.com/recipes/577551-trace-decorator-for-debugging/

<p style="color: grey"> Python recipe 577551 by <a href="/recipes/users/4173535/">Kevin L. Sitze</a> (<a href="/recipes/tags/classes/">classes</a>, <a href="/recipes/tags/debug/">debug</a>, <a href="/recipes/tags/debugging/">debugging</a>, <a href="/recipes/tags/decorators/">decorators</a>, <a href="/recipes/tags/functions/">functions</a>, <a href="/recipes/tags/inspection/">inspection</a>, <a href="/recipes/tags/modules/">modules</a>, <a href="/recipes/tags/trace/">trace</a>). Revision 2. </p> <p>This package provides a decorator for tracing function and method calls in your applications. The tracing capabilities are managed through the logging package, and several mechanisms are provided for controlling the destination of the trace output.</p> <p>It also provides functionality for adding decorators to existing classes or modules.</p>