[issue41244] Change to use str.join() instead of += when concatenating string

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Changes in bpo-41242 were rejected not because the new code is worse, but because it is not obviously and significantly better that the existing code. Here status quo wins for the same reasons. This rule saves us from endless rewriting the code and allows to focus on important things.

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nosy: +serhiy.storchaka

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