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Mon Jan 18 03:39:42 EST 2016 · https://mail.python.org/pipermail/python-dev/2016-January/142755.html

On Jan 17, 2016, at 11:10, Brett Cannon <brett at python.org> wrote:
> 
> 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?

There are two ways you could do that.

The first is to just change "braces may be omitted where C permits, but when present, they should be formatted as follows" to something like "braces must not be omitted, and should be formatted as follows", changing one-liner tests into this:

    if (!obj) {
        return -1;
    }

Alternatively, it could say something like "braces must not be omitted; when other C styles would use a braceless one-liner, a one-liner with braces should be used instead; otherwise, they should be formatted as follows", changing the same tests into:

    if (!obj) { return -1; }

The first one is obviously a much bigger change in the formatting of actual code, even if it's a simpler change to the PEP. Is that what was intended?
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[Python-Dev] Update PEP 7 to require curly braces in C