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Sat Jun 3 12:25:25 EDT 2017 · https://mail.python.org/pipermail/python-dev/2017-June/148223.html

Yet about braces. PEP 7 implicitly forbids breaking the line before an 
opening brace. An opening brace should stay at the end the line of the 
outer compound statement.

     if (mro != NULL) {
         ...
     }
     else {
         ...
     }

     if (type->tp_dictoffset != 0 && base->tp_dictoffset == 0 &&
         type->tp_dictoffset == b_size &&
         (size_t)t_size == b_size + sizeof(PyObject *)) {
         return 0; /* "Forgive" adding a __dict__ only */
     }

But the latter example continuation lines are intended at the same level 
as the following block of code. I propose to make exception for that 
case and allow moving an open brace to the start of the next line.

     if (type->tp_dictoffset != 0 && base->tp_dictoffset == 0 &&
         type->tp_dictoffset == b_size &&
         (size_t)t_size == b_size + sizeof(PyObject *))
     {
         return 0; /* "Forgive" adding a __dict__ only */
     }

This adds a visual separation of a multiline condition from the 
following code.

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[Python-Dev] PEP 7 and braces { .... } on if