Stefan Behnel, 15.08.2011 11:33:
I just stumbled over this:
>>> A = 1
>>> def foo(x):
... A = x
... class X:
... a = A
... return X
...
>>> foo(2).a
2
>>> def foo(x):
... A = x
... class X:
... A = A
... return X
...
>>> foo(2).A
1
Works that way in Py2.7 and Py3.3.
I couldn't find any documentation on this, but my *guess* about the
reasoning is that the second case contains an assignment to A inside of the
class namespace, and assignments make a variable local to a scope, in this
case, the function scope. Therefore, the A on the rhs is looked up in that
scope as well. However, this is just a totally hand waving guess.
... and an incorrect one, as it turns out. I think I misinterpreted the
results the wrong way around. Still:
Does anyone have a better explanation or know of a place where this
specific behaviour is documented?
Stefan
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