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I stumble upon this bug when porting a Python 2 codebase to 3 and suddenly got a NameError for the following code.
 class Foo:
 a = [1,2,3]
 b = [4,5,6]
 c = [x * y for x in a for y in b]
 NameError: name 'b' is not defined
Not sure what could be done at this point but I thought I'd leave some feedback given I was surprised this would break given it works just fine if not defined at the class level.
 a = [1,2,3]
 b = [4,5,6]
 c = [x * y for x in a for y in b]