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From: Rob Williscroft <rtw@rtw.me.uk>
Subject: Re: Returning a value from exec or a better solution
Date: Tue, 30 Aug 2011 07:37:37 +0000 (UTC)
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:12430

Jack Trades wrote in news:CAG5udOiOAge3uHrGSDTZ412GAg+CC-
6u8iGOyJ0Lnf3HnwUVzA@mail.gmail.com in gmane.comp.python.general:

>> >>> class CapturingDict(dict):
>> ...     def __setitem__(self, key, val):
>> ...         self.key, self.val = key, val
>> ...         dict.__setitem__(self, key, val)
>> ...
>> >>> c = CapturingDict()
>> >>> exec("def myfunction(x): return 1", c)
>> >>> c.key
>> 'myfunction'
>> >>> c.val
>> <function myfunction at 0x100634d10>
>>
>> HTH,
>>
>> --
>> Arnaud
>>
> 
> That's brilliant and works flawlessly.  Thank you very much!

If an impementation (as you say up thread) can populate globals 
or locals with whatever they want, then how do you know that last 
item added was the function definition the user supplied ?

Rob.