http://code.activestate.com/recipes/tags/programs/top/2013-03-07T07:33:09-08:00ActiveState Code Recipes2010-11-16T08:36:38-08:00Raymond Hettingerhttp://code.activestate.com/recipes/users/178123/http://code.activestate.com/recipes/277940-decorator-for-bindingconstants-at-compile-time/

<p style="color: grey"> Python recipe 277940 by <a href="/recipes/users/178123/">Raymond Hettinger</a> (<a href="/recipes/tags/programs/">programs</a>). Revision 9. </p> <p>Decorator for automatic code optimization. If a global is known at compile time, replace it with a constant. Fold tuples of constants into a single constant. Fold constant attribute lookups into a single constant.</p>

2004-12-03T09:13:43-08:00Raymond Hettingerhttp://code.activestate.com/recipes/users/178123/http://code.activestate.com/recipes/355045-spreadsheet/

<p style="color: grey"> Python recipe 355045 by <a href="/recipes/users/178123/">Raymond Hettinger</a> (<a href="/recipes/tags/programs/">programs</a>). Revision 2. </p> <p>Use eval() to drive spreadsheet style logic. The sleeper feature of Py2.4 is the ability to use any object with a mapping interface as the locals argument to eval().</p>

2005-01-31T22:06:30-08:00Maxim Krikunhttp://code.activestate.com/recipes/users/1085177/http://code.activestate.com/recipes/365013-linear-equations-solver-in-3-lines/

<p style="color: grey"> Python recipe 365013 by <a href="/recipes/users/1085177/">Maxim Krikun</a> (<a href="/recipes/tags/programs/">programs</a>). Revision 2. </p> <p>Just a little bit of hack: a linear equations solver using eval and built-in complex numbers:</p> <pre class="prettyprint"><code>&gt;&gt;&gt; solve("x - 2*x + 5*x - 46*(235-24) = x + 2") 3236.0 </code></pre>

2005-05-09T16:53:44-07:00Zoran Isailovskihttp://code.activestate.com/recipes/users/2400454/http://code.activestate.com/recipes/413486-first-class-enums-in-python/

<p style="color: grey"> Python recipe 413486 by <a href="/recipes/users/2400454/">Zoran Isailovski</a> (<a href="/recipes/tags/programs/">programs</a>). Revision 7. </p> <p>True immutable symbolic enumeration with qualified value access.</p>

2004-09-01T21:11:14-07:00Shai Bergerhttp://code.activestate.com/recipes/users/2014324/http://code.activestate.com/recipes/303057-pythologic-prolog-syntax-in-python/

<p style="color: grey"> Python recipe 303057 by <a href="/recipes/users/2014324/">Shai Berger</a> (<a href="/recipes/tags/programs/">programs</a>). </p> <p>Some of Python's powerful meta-programming features are used to enable writing Python functions which include Prolog-like statements. Such functions load a Prolog-like database. When coupled with a suitable inference engine for logic databases, this is a way to add logical programming -- the last unsupported major paradigm -- to Python. Start at the bottom of the code for an example of the enabled syntax.</p>

2009-09-15T00:34:37-07:00Gabriel Genellinahttp://code.activestate.com/recipes/users/924636/http://code.activestate.com/recipes/576904-decorator-for-bindingconstants-at-compile-time/

<p style="color: grey"> Python recipe 576904 by <a href="/recipes/users/924636/">Gabriel Genellina</a> (<a href="/recipes/tags/optimisation/">optimisation</a>, <a href="/recipes/tags/optimization/">optimization</a>, <a href="/recipes/tags/programs/">programs</a>). </p> <p>Decorator for automatic code optimization. If a global is known at compile time, replace it with a constant. Fold tuples of constants into a single constant. Fold constant attribute lookups into a single constant.</p> <p>This is only an update of <a href="http://code.activestate.com/recipes/277940/">Recipe 277940</a>, making it compatible with Python 3. All credit must go to the original author, Raymond Hettinger.</p>

2008-10-22T08:15:26-07:00Anandhttp://code.activestate.com/recipes/users/760763/http://code.activestate.com/recipes/553262-list-classes-methods-and-functions-in-a-module/

<p style="color: grey"> Python recipe 553262 by <a href="/recipes/users/760763/">Anand</a> (<a href="/recipes/tags/programs/">programs</a>). Revision 5. </p> <p>The recipe provides a method "describe" which takes a module as argument and describes classes, methods and functions in the module. The method/function description provides information on the function/method arguments using the inspect module.</p>

2006-03-10T20:52:36-08:00Edward Loperhttp://code.activestate.com/recipes/users/2637812/http://code.activestate.com/recipes/475109-regular-expression-for-python-string-literals/

<p style="color: grey"> Python recipe 475109 by <a href="/recipes/users/2637812/">Edward Loper</a> (<a href="/recipes/tags/programs/">programs</a>). </p> <p>A regular expression that matches Python string literals. Tripple-quoted, unicode, and raw strings are supported.</p>

2006-03-07T04:53:21-08:00Maciej Obarskihttp://code.activestate.com/recipes/users/2559120/http://code.activestate.com/recipes/474122-neat-notation-for-python-closures/

<p style="color: grey"> Python recipe 474122 by <a href="/recipes/users/2559120/">Maciej Obarski</a> (<a href="/recipes/tags/programs/">programs</a>). </p> <p>Alternative notation for defining closures in python; It avoids packing closure variables into containers by assigning attributes to the inner function.</p>

2013-03-07T07:33:09-08:00Deepakhttp://code.activestate.com/recipes/users/4183429/http://code.activestate.com/recipes/578481-linear-equations-solver-in-3-lines/

<p style="color: grey"> Python recipe 578481 by <a href="/recipes/users/4183429/">Deepak</a> (<a href="/recipes/tags/programs/">programs</a>). </p> <p>Just a little bit of hack: a linear equations solver using eval and built-in complex numbers:</p> <pre class="prettyprint"><code>&gt;&gt;&gt; solve("x - 2*x + 5*x - 46*(235-24) = x + 2") 3236.0 </code></pre>

2010-03-17T07:27:15-07:00Anandhttp://code.activestate.com/recipes/users/760763/http://code.activestate.com/recipes/576690-pyscanlogger-python-port-scan-detector/

<p style="color: grey"> Python recipe 576690 by <a href="/recipes/users/760763/">Anand</a> (<a href="/recipes/tags/network/">network</a>, <a href="/recipes/tags/programs/">programs</a>, <a href="/recipes/tags/security/">security</a>). Revision 5. </p> <p>A pure Python program to detect network port scanning attacks. Currently logs different TCP port scans. Can run in the background like a daemon and log attacks to a log file.</p>

2007-09-25T22:48:21-07:00Raymond Hettingerhttp://code.activestate.com/recipes/users/178123/http://code.activestate.com/recipes/532903-how-__slots__-are-implemented/

<p style="color: grey"> Python recipe 532903 by <a href="/recipes/users/178123/">Raymond Hettinger</a> (<a href="/recipes/tags/programs/">programs</a>). Revision 2. </p> <p>Pure python equivalent of the __slots__ implementation using descriptors and a metaclass.</p>

2005-11-01T10:36:05-08:00Stephen Chappellhttp://code.activestate.com/recipes/users/2608421/http://code.activestate.com/recipes/442503-extracting-targz-files-in-windows/

<p style="color: grey"> Python recipe 442503 by <a href="/recipes/users/2608421/">Stephen Chappell</a> (<a href="/recipes/tags/programs/">programs</a>). </p> <p>This recipe is meant to be used as a commmand line *.tar.gz file extractor. If it fails, then a usage note is given. It may be small, but it can be very useful for some people.</p>

2005-05-08T10:42:59-07:00Zoran Isailovskihttp://code.activestate.com/recipes/users/2400454/http://code.activestate.com/recipes/413487-quick-test-if-strings-are-identifiers/

<p style="color: grey"> Python recipe 413487 by <a href="/recipes/users/2400454/">Zoran Isailovski</a> (<a href="/recipes/tags/programs/">programs</a>). Revision 3. </p> <p>Sometimes you need strings to be true identifiers, for ex. to represent symbolic names. Smalltalk offers the type 'Symbol' for this purpose. In python, you need to test this explicitly. Here is a quick way.</p>

2005-04-18T23:52:25-07:00Chad J. Schroederhttp://code.activestate.com/recipes/users/1760491/http://code.activestate.com/recipes/409413-a-python-based-descriptive-statistical-analysis-to/

<p style="color: grey"> Python recipe 409413 by <a href="/recipes/users/1760491/">Chad J. Schroeder</a> (<a href="/recipes/tags/programs/">programs</a>). Revision 2. </p> <p>A Python module implementing a class which can be used for computing numerical statistics for a given data set.</p>

2005-02-18T23:22:55-08:00Shannon -jj Behrenshttp://code.activestate.com/recipes/users/2269827/http://code.activestate.com/recipes/363786-runningcalc/

<p style="color: grey"> Python recipe 363786 by <a href="/recipes/users/2269827/">Shannon -jj Behrens</a> (<a href="/recipes/tags/programs/">programs</a>). Revision 2. </p> <p>This is a trivial calculator "shell" with a running total. As trivial as it is, I find it to be more useful than a normal calculator when doing my checkbook because of the ever-present running total.</p> <p>Sed is to Vi as RunningCalc is to Python</p> <p>python ~/programming/python/hacks/RunningCalc.py $ 0.0+50 $ 50.0-10 $ 40.0*0 $ 0.0+5 $ 5.0-2 $ 3.0</p>

2004-12-15T02:54:25-08:00S Whttp://code.activestate.com/recipes/users/1759688/http://code.activestate.com/recipes/358603-a-speed-limited-or-governed-range/

<p style="color: grey"> Python recipe 358603 by <a href="/recipes/users/1759688/">S W</a> (<a href="/recipes/tags/programs/">programs</a>). Revision 3. </p> <p>This class implements a generator, which returns consecutive floats which are incremented by a speed * (time between calls).</p>

2004-09-28T19:12:23-07:00Raymond Hettingerhttp://code.activestate.com/recipes/users/178123/http://code.activestate.com/recipes/305313-xml-directory-tree/

<p style="color: grey"> Python recipe 305313 by <a href="/recipes/users/178123/">Raymond Hettinger</a> (<a href="/recipes/tags/programs/">programs</a>). Revision 4. </p> <p>Builds a directory tree in XML format. Demonstrates how to use xml.dom.minidom to rapidly construct nested XML with multiple element types and attributes. Serves as a model for building model complex documents.</p>

2004-06-18T10:57:33-07:00Sami Hangaslammihttp://code.activestate.com/recipes/users/118800/http://code.activestate.com/recipes/286147-function-decorators-by-hacking-bytecodes/

<p style="color: grey"> Python recipe 286147 by <a href="/recipes/users/118800/">Sami Hangaslammi</a> (<a href="/recipes/tags/programs/">programs</a>). Revision 2. </p> <p>Wether or not PEP 318 makes it to Python 2.4, you can experiment with an alternative decorator syntax in Python 2.3 by hacking with bytecodes.</p>

2003-05-06T09:36:03-07:00Raymond Hettingerhttp://code.activestate.com/recipes/users/178123/http://code.activestate.com/recipes/198157-improve-dictionary-lookup-performance/

<p style="color: grey"> Python recipe 198157 by <a href="/recipes/users/178123/">Raymond Hettinger</a> (<a href="/recipes/tags/programs/">programs</a>). Revision 3. </p> <p>Reduce average dictionary lookup time by making the internal tables more sparse.</p>