Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

Changing the major version number itself is a breaking change. For example, 
there is a code that checks sys.version_info[0] == 3 or even sys.version[0] == 
"3".

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nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37636>
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