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POWhy can't I use vars() when I try to call it within a function?
 

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  1. POWhy can't I use vars() when I try to call it within a function?
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    <p>I have a dict of strings, and those strings correspond to function names. I'm trying to use vars() to assign those strings to variables that I can then use for function calls. I'm able to get vars() to work outside of a function, but when I try to call it within a function, I get a KeyError. The code below obviously isn't the actual code I am having trouble with, but the problem is the same: I can find the key in the vars() dict, but I can't call it from a function. </p> <p>vars() working:</p> <pre><code>In [1]: def brian(): ...: print "this is the brian function" ...: In [2]: name = 'brian' In [3]: x = vars()[name] In [4]: x() this is the brian function </code></pre> <p>vars() not working (within a function):</p> <pre><code>In [20]: def brian(): ....: print "this is the brian function" ....: In [21]: def run_it(): ....: name = 'brian' ....: x = vars()[name] ....: x() ....: In [22]: run_it() --------------------------------------------------------------------------- KeyError Traceback (most recent call last) &lt;ipython-input-22-15adf33a5fea&gt; in &lt;module&gt;() ----&gt; 1 run_it() &lt;ipython-input-21-5663ac30227d&gt; in run_it() 1 def run_it(): 2 name = 'brian' ----&gt; 3 x = vars()[name] 4 x() 5 KeyError: 'brian' </code></pre> <p>And finally, here's vars() (which <em>does</em> include the key 'brian'):</p> <pre><code>In [4]: vars() Out[4]: {'In': ['', u'def brian():\n print "this is the brian function"\n ', u"def run_it():\n name = 'brian'\n x = vars()[name]\n x()\n ", u'run_it()', u'vars()'], 'Out': {}, '_': '', '__': '', '___': '', '__builtin__': &lt;module '__builtin__' (built-in)&gt;, '__builtins__': &lt;module '__builtin__' (built-in)&gt;, '__doc__': 'Automatically created module for IPython interactive environment', '__name__': '__main__', '_dh': [u'/Users/brian'], '_i': u'run_it()', '_i1': u'def brian():\n print "this is the brian function"\n ', '_i2': u"def run_it():\n name = 'brian'\n x = vars()[name]\n x()\n ", '_i3': u'run_it()', '_i4': u'vars()', '_ih': ['', u'def brian():\n print "this is the brian function"\n ', u"def run_it():\n name = 'brian'\n x = vars()[name]\n x()\n ", u'run_it()', u'vars()'], '_ii': u"def run_it():\n name = 'brian'\n x = vars()[name]\n x()\n ", '_iii': u'def brian():\n print "this is the brian function"\n ', '_oh': {}, '_sh': &lt;module 'IPython.core.shadowns' from '/Library/Frameworks/Python.framework/Versions /2.7/lib/python2.7/site-packages/IPython/core/shadowns.pyc'&gt;, 'brian': &lt;function __main__.brian&gt;, 'exit': &lt;IPython.core.autocall.ExitAutocall at 0x1598cb0&gt;, 'get_ipython': &lt;bound method TerminalInteractiveShell.get_ipython of &lt;IPython.frontend.terminal.interactiveshell.TerminalInteractiveShell object at 0x1589f70&gt;&gt;, 'help': Type help() for interactive help, or help(object) for help about object., 'quit': &lt;IPython.core.autocall.ExitAutocall at 0x1598cb0&gt;, 'run_it': &lt;function __main__.run_it&gt;} </code></pre>
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    1. USBrian Dant
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