Bugs item #1177811, was opened at 2005-04-06 16:30 Message generated for change (Comment added) made by effbot You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1177811&group_id=5470
Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Python Interpreter Core Group: Python 2.4 Status: Open Resolution: None Priority: 5 Submitted By: Andrew Wilkinson (andrew_j_w) Assigned to: Nobody/Anonymous (nobody) Summary: Exec Inside A Function Initial Comment: When 'exec'ing code that creates a function inside a function the defined function (fact in the example below) is created with the module level namespace as it's parent scope. The following should return 2 however it raises a NameError as fact is not defined. def f(): exec """ def fact(x): if x==1: return 1 else: return x*fact(x-1) """ return fact f()(2) If you run following code... def f(): exec """ def fact(x): if x==1: return 1 else: return x*fact(x-1) """ in locals() return fact ... it works as expected. The documentation states that "In all cases, if the optional parts are omitted, the code is executed in the current scope." That is clearly not the case here as the 'fact' function is set with the module level scope as it's parent scope. It would appear to me that either this a documentation bug or a flaw in exec. I sincerely hope this a bug in exec and not the desired behaviour as it doesn't make any sense to me... ---------------------------------------------------------------------- >Comment By: Fredrik Lundh (effbot) Date: 2005-11-12 17:59 Message: Logged In: YES user_id=38376 As described in the language reference, scope analysis is done statically, during compilation. If the compiler cannot see your innermost function (because you've hidden it inside a string literal), it obviously cannot take any variables in there into account when generating code for the outer scopes. (I sincerely hope that this is a contrived example, and that you're not trying to use exec in this way in real code. Python might be a highly dynamic language, but it's not this dynamic.) ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1177811&group_id=5470 _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
