[issue34964] Make Tkinter sources more readable by adding blank lines

[Serhiy Storchaka]

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


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keywords: +patch
pull_requests: +9199
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34964>
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