[issue8828] Atomic function to rename a file

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

So how about providing a new public `os` module function doing a rename-with-overwrite on all platforms?
We could name it e.g. os.replace().
os.rename_overwrite() is another possibility, more explicit but also longer.

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stage:  -> needs patch

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<http://bugs.python.org/issue8828>
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