[Python-Dev] issue5578 - explanation (original) (raw)

Guido van Rossum guido at python.org
Wed Apr 1 05:25:01 CEST 2009

Well hold on for a minute, I remember we used to have an exec statement in a class body in the standard library, to define some file methods in socket.py IIRC. It's a totally different case than exec in a nested function, and I don't believe it should be turned into a syntax error at all. An exec in a class body is probably meant to define some methods or other class attributes. I actually think the 2.5 behavior is correct, and I don't know why it changed in 2.6.

--Guido

On Tue, Mar 31, 2009 at 8:15 PM, Maciej Fijalkowski <fijall at gmail.com> wrote:

So. The issue was closed and I suppose it was closed by not entirely understanding the problem (or I didn't get it completely).

The question is - what the following code should do? def f():  a = 2  class C:  exec 'a = 42'  abc = a  return C print f().abc (quick answer - on python2.5 it return 42, on python 2.6 and up it returns 2, the patch changes it to syntax error). I would say that returning 2 is the less obvious thing to do. The reason why IMO this should be a syntax error is this code: def f():  a = 2  def g():  exec 'a = 42'  abc = a which throws syntax error. Cheers, fijal

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-- --Guido van Rossum (home page: http://www.python.org/~guido/)

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