[issue40841] Provide mimetypes.sniff API as stdlib

[Dong-hee Na]

Dong-hee Na <donghee.na92 at gmail.com> added the comment:

> This looks like a useful addition. I hope someone will take up the review!

Thank you guido!
I also think that this API is good to be added to the standard library and it would be very useful!

I hope that someone would like to interest in this issue ;)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40841>
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