[docs] [issue33666] Document removal of os.errno

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Actually removing re._pattern_type, uuid._uuid_generate_time and some private names in the typing module broke several third-party projects. See for example:

https://github.com/search?q=_pattern_type&type=Issues
https://github.com/search?q=_uuid_generate_time&type=Issues
https://github.com/bintoro/overloading.py/issues/5
https://github.com/hsolbrig/PyShEx/issues/17

I'm sure there are examples for other removed names. I don't understand why os.errno should be special.

Books can contain errors (e.g. the claim that Python 3 is not Turing complete).

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