[issue36762] Teach "import *" to warn when overwriting globals or builtins

[Raymond Hettinger]

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

> What if existing globals are overwritten intentionally?

That's why it would be a warning instead of an error.  Also, with warnings we can suppress specific instances (by module or by message).

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<https://bugs.python.org/issue36762>
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