[issue42699] Use `.join(k for k in g)` instead of `.join([k for k in g])`

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

See https://github.com/ikamensh/flynt#dangers-of-conversion for reasons.

Would I like to see all string literal formatting done with f-strings? Yes!

Would I accept the risk and hassle of doing it blindly? No.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42699>
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