Serhiy Storchaka added the comment:

I also always wanted to experiment this change. But I was afraid that providing 
such macros can encourage of overusing it. I don't want to wrap any test for 
NULL or -1 with these macros.

If we expect some benefit from using these macros, I would play with them in 
hot loops. For example in dict lookup function (unlikely comparing keys raise 
an exception or dict is modified in process of searching), in codecs (unlikely 
illegal sequence is occurred), etc.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29461>
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