[docs] [issue32413] Document that locals() may return globals()

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

FWIW, this isn't a quirk of how locals() works.  Instead, it reflects the more interesting reality that at the top level, locals and globals *are* the same dictionary.   Also, that is not the only occurrence -- if exec() is called with only one dictionary, that dict is used for both locals and globals.

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<https://bugs.python.org/issue32413>
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