Illia Polosukhin added the comment:

Additionally, in macros Py_XINCREF and Py_XDECREF we've took an opportunity to 
increase readability by changing expression:
> if (item == NULL) ; else action(item);
to more natural inverted condition:
> if (item != NULL) action(item);

There is a chance that there may be a reason for this form of expression, so 
let me know if this is an issue.

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nosy: +larry

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17206>
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