John McDonald added the comment:
Could we possibly revisit this? This feels like an implementation detail, not
something specified. Consider the different cases:
Type "help", "copyright", "credits" or "license" for more information.
>>> class A:
... b = 5
... print(locals())
... x = [i*i for i in range(b)]
...
{'__qualname__': 'A', '__locals__': {...}, '__module__': '__main__', 'b': 5}
This case works, and shows that 'b' is clearly in locals().
>>> class A:
... b = 5
... c = b * b
... print(locals())
... d = []
... for i in range(b):
... d.append(i*i)
... print(locals())
... e = [i*i for i in range(b) if i*i < c]
...
{'__locals__': {...}, '__qualname__': 'A', 'b': 5, '__module__': '__main__',
'c': 25}
{'__qualname__': 'A', 'b': 5, '__module__': '__main__', 'c': 25, 'i': 4, 'd':
[0, 1, 4, 9, 16], '__locals__': {...}}
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 9, in A
File "<stdin>", line 9, in <listcomp>
NameError: global name 'c' is not defined
Again, it feels really arbitrary that the variable can be used in certain
places in the list comprehension, but not others.
And of course, all of this works properly if you place the definitions either
at global scope or within a function.
----------
nosy: +John.McDonald
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Python tracker <[email protected]>
<http://bugs.python.org/issue3692>
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