"Neil Cerutti" <[EMAIL PROTECTED]> writes:
> You cannot access a class's class variables in it's class-statement
> scope, since the name of the type is not bound until after the class
> statement is completed.
But they are still available as locals, so you can access them using
their names, like this:
>>> class C:
... a = 1
... b = 2
... print a+b
...
3
The question is, why doesn't the OP's code snippet work? It seems
that the generator expression can't read the surrounding locals().
But when you change the generator expression to a list comprehension
using a pair of [] around it, it starts working. Compare:
class C(object):
d = {}
for a in 1, 2, 3:
ignore = list((a, b) for b in (4, 5, 6))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 4, in C
File "<stdin>", line 4, in <genexpr>
NameError: global name 'a' is not defined
with:
class C(object):
d = {}
for a in 1, 2, 3:
ignore = [(a, b) for b in (4, 5, 6)]
It seems that generator expressions and list comprehensions have
subtly different scoping rules. Whether this is a bug or not is a
good question.
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