Nathaniel Smith <n...@pobox.com> added the comment:

What should happen for:

def f():
    if random.random() < 0.5:
        a = 1
        b = 2
    else:
        b = 1
        a = 2
    return locals()

? Right now co_varnames preserves the order that names were encountered when 
compiling, so it'd be easy to make 'a' come before 'b' in locals(), so the 
above function returns either {'a': 1, 'b': 2} or {'a': 2, 'b': 1}.

If we want to preserve the illusion that local variables are entries in the 
locals() dict, though, then the dict ought to be either {'a': 1, 'b': 2}, {'b': 
1, 'a': 2}. Making this happen would require extra machinery for an extreme 
edge case so I'm guessing it's not worth it though.

----------
nosy: +njs

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32690>
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