[docs] [issue37813] PEP 7 line-breaking with binary operations contradicts Knuth's rule

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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versions:  -Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37813>
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