[issue6647] warnings.catch_warnings is not thread-safe

[Antoine Pitrou]

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

Any function whose purpose is to mutate global (non thread-local) state
is inherently "thread-unsafe". The only reasonable possibility is to
document it as such.

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assignee:  -> georg.brandl
components: +Documentation
nosy: +georg.brandl, pitrou

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<http://bugs.python.org/issue6647>
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