Matthew Barnett <pyt...@mrabarnett.plus.com> added the comment:

It's not just in the 'if' clause:

>>> class Foo:
...     a = ['a', 'b']
...     b = ['b', 'c']
...     c = [b for x in a]
...
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 4, in Foo
  File "<stdin>", line 4, in <listcomp>
NameError: name 'b' is not defined

----------
nosy: +mrabarnett

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45899>
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