http://code.activestate.com/recipes/tags/evaluation-expressions/2016-10-31T21:53:30-07:00ActiveState Code Recipes2016-10-31T21:53:30-07:00Vasudev Ramhttp://code.activestate.com/recipes/users/4173351/http://code.activestate.com/recipes/580712-easily-create-a-python-repl-in-python/

<p style="color: grey"> Python recipe 580712 by <a href="/recipes/users/4173351/">Vasudev Ram</a> (<a href="/recipes/tags/code_module/">code_module</a>, <a href="/recipes/tags/dynamic/">dynamic</a>, <a href="/recipes/tags/evaluation/">evaluation</a>, <a href="/recipes/tags/read_eval_print_loop/">read_eval_print_loop</a>, <a href="/recipes/tags/repl/">repl</a>). </p> <p>This recipe shows how to easily create a Python REPL (Read-Eval-Print Loop) in Python itself. This can allow the user to interact with a running Python program, including typing in Python statements at the REPL prompt, defining functions, using and changing variables that were set before the interaction started, and those variables modified during the interaction, will persist in the memory of the program, for any use, even after the interaction is over, as long as the program continues to run.</p>

2015-09-30T15:12:17-07:00Vasudev Ramhttp://code.activestate.com/recipes/users/4173351/http://code.activestate.com/recipes/579105-how-a-python-function-can-find-the-name-of-its-cal/

<p style="color: grey"> Python recipe 579105 by <a href="/recipes/users/4173351/">Vasudev Ram</a> (<a href="/recipes/tags/evaluation/">evaluation</a>, <a href="/recipes/tags/introspection/">introspection</a>, <a href="/recipes/tags/python/">python</a>, <a href="/recipes/tags/sys/">sys</a>). </p> <p>This recipe shows how a Python function can find out the name of its caller, i.e. which other Python function has called it.</p>

2011-02-24T10:17:32-08:00Jakub Jankiewiczhttp://code.activestate.com/recipes/users/4028109/http://code.activestate.com/recipes/577585-universal-eval-to-string-function/

<p style="color: grey"> Python recipe 577585 by <a href="/recipes/users/4028109/">Jakub Jankiewicz</a> (<a href="/recipes/tags/evaluation/">evaluation</a>, <a href="/recipes/tags/exec/">exec</a>, <a href="/recipes/tags/python/">python</a>, <a href="/recipes/tags/python_scripts/">python_scripts</a>). </p> <p>This is a function that evaluate all expressions and statements and return the result as a string. It also return Exceptions as strings. It is used in <a href="http://trypython.jcubic.pl">trypython.jcubic.pl</a></p>

2009-04-26T18:10:55-07:00Sridhar Ratnakumarhttp://code.activestate.com/recipes/users/4169511/http://code.activestate.com/recipes/576720-lazy-property/

<p style="color: grey"> Python recipe 576720 by <a href="/recipes/users/4169511/">Sridhar Ratnakumar</a> (<a href="/recipes/tags/evaluation/">evaluation</a>, <a href="/recipes/tags/lazy/">lazy</a>, <a href="/recipes/tags/lazy_evaluation/">lazy_evaluation</a>). Revision 6. </p> <p>Python does not have lazy evaluation syntax features built-in, but fortunately decorators can be used with new-style classes to emulate such a feature. There are cases where one wants <code>foo.property</code> to return the actual property whose calculation takes significant amount of time.</p> <p>This recipe adapts the existing <code>property</code> to provide a <code>lazypropery</code> decorator that does this.</p> <p>See the first comment below for an example usage.</p> <p>Also see: <a href="http://en.wikipedia.org/wiki/Lazy_initialization">lazy initialization</a></p>