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

R. David Murray rdmurray at bitdance.com
Wed Apr 1 17:00:06 CEST 2009

On Wed, 1 Apr 2009 at 13:12, Chris Withers wrote:

Guido van Rossum wrote:

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. But why an exec?! Surely there must be some other way to do this than an exec?

Maybe, but this sure is gnarly code:

 _s = ("def %s(self, *args): return self._sock.%s(*args)\n\n"
       "%s.__doc__ = _realsocket.%s.__doc__\n")
 for _m in _socketmethods:
     exec _s % (_m, _m, _m, _m)
 del _m, _s

Guido's memory is good, that's from the _socketobject class in socket.py.

--David

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