[Python-Dev] Update PEP 7 to require curly braces in C

[Brett Cannon]

While doing a review of http://bugs.python.org/review/26129/ I asked to
have curly braces put around all `if` statement bodies. Serhiy pointed out
that PEP 7 says curly braces are optional:
https://www.python.org/dev/peps/pep-0007/#id5. I would like to change that.

My argument is to require them to prevent bugs like the one Apple made with
OpenSSL about two years ago:
https://www.imperialviolet.org/2014/02/22/applebug.html. Skipping the curly
braces is purely an aesthetic thing while leaving them out can lead to
actual bugs.

Anyone object if I update PEP 7 to remove the optionality of curly braces
in PEP 7?
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