[issue37857] Setting logger.level directly has no effect due to caching in 3.7+

[Vinay Sajip]

Vinay Sajip <vinay_sajip at yahoo.co.uk> added the comment:

> Obviously the fix could be just to stop doing that in the standard library

Well, that's the right fix, and thanks for spotting it. I've applied those changes (42b6c5d and 19c42fb) to the master, 3.8 and 3.7 branches.

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