[issue9226] erroneous behavior when creating classes inside a closure
Guido van Rossum
report at bugs.python.org
Sat Jul 24 17:23:22 CEST 2010
Guido van Rossum <guido at python.org> added the comment:
Hm. This seems an old bug, probably introduced when closures where first introduced (2.1 ISTR, by Jeremy Hylton).
Class scopes *do* behave differently from function scopes; outside a nested function, this should work:
x = 1
class C(object):
x = x
assert X.x == 1
And I think it should work that way inside a function too.
So IMO the bug is that in classes Test and Test3, the x defined in the function scope is not used. Test2 shows that normally, the x defined in the inner scope is accessed.
So, while for *function scopes* the rules are "if it is assigned anywhere in the function, every reference to it references the local version", for *class scopes* (outsided methods) the lookup rules are meant to be dynamic, meaning "if it isn't defined locally yet at the point of reference, use the next outer definition".
I haven't reviewed the patches.
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<http://bugs.python.org/issue9226>
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