[docs] [issue27455] Fix tkinter examples to be PEP8 compliant

[John Hagen]

John Hagen added the comment:

@Terry The reason for changing the quotes was for consistency, since everywhere else on that page used double quotes. That being said, I don't have a strong preference and will happily revert it if that is the consensus. I'm +0 on the change.

I personally use single quotes everywhere and use flake8-quotes to help with this.

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<http://bugs.python.org/issue27455>
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