__buitins__ key added during eval()

[Gary M. Josack]

William Purcell wrote:
> I want to use eval to evaluate wx.TextCtrl inputs. How can I keep 
> python from adding the __builtins__ key to mydict when I use it with 
> eval? Other wise I have to __delitem__('__builtins__') everytime I use 
> eval?
>
> >>> mydict = {'a':2,'b':3}
> >>> eval('a*b',mydict)
> 6
> >>> mydict
> {'a': 2, '__builtins__': {'IndexError': <type 
> 'exceptions.IndexError'>, ...(I'll spare you the rest)...}, 'b': 3}
>
> Also, how come eval has this behavior? Is it desirable?
>
> -Bill
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no too sure, but eval('a*b', None, mydict) seems to work how you expect.