[issue17546] Document the circumstances where the locals() dict gets updated

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

The previous title, "rename type returned by locals() to livedict" did not describe the reality, since locals() returns a regular dict.
[Would you call x.__dict__ a livedict?]

So either this issue should be closed as invalid, because it's based on incorrect understandings of Python internals; or we could improve documentation about locals() in order to remove surprising behavior and (real) confusion in programmers' minds.

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nosy: +amaury.forgeotdarc

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<http://bugs.python.org/issue17546>
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