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>>> class A(object):
... i = 3
... a = [i for x in range(3)]
>>> class A(object):
... i = 3
... a = list(i for x in range(3))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 3, in A
File "<stdin>", line 3, in <genexpr>
NameError: global name 'i' is not defined
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