Co-authored-by: Maxwell <maxwellpxt@gmail.com>
Co-authored-by: Stéphane Wirtel <stephane@wirtel.be>





https://bugs.python.org/issue35899

https://bugs.python.org/issue17467

sys and threading were imported twice.

* bpo-29577: allow multiple mixin classes

* raise exception if _missing_ returns None or invalid type

* Fix enum members getting shadowed by parent attributes
* Move Enum._convert to EnumMeta._convert_
* Deprecate _convert

* bpo-33217: Raise TypeError for non-Enum lookups in Enums

* bpo-31801:  Enum:  add _ignore_ as class option

_ignore_ is a list, or white-space seperated str, of names that will not
be candidates for members; these names, and _ignore_ itself, are removed
from the final class.

* bpo-31801:  Enum:  add documentation for _ignore_

* bpo-31801: Enum: remove trailing whitespace

* bpo-31801: Enum: fix bulleted list format

* bpo-31801: add version added for _ignore_

* Remove Setup.config
* Always define WITH_THREAD for compatibility.

* bpo-30616: Functional API of enum allows to create empty enums.

* Update NEWS

move addition to avoid conflict

close issue28172: Change all example enum member names to uppercase, per Guido; patch by Chris Angelico.

Based on patch by Ville Skyttä.

consistent name for values having multiple names.  Ex: signal.Signals(6)
now refers to itself as signal.SIGALRM rather than flipping between that
and signal.SIGIOT based on the interpreter's hash randomization seed.

This helps finish issue27167.

update Finer Points section of docs to cover boolean evaluation;
add more tests for pure and mixed boolean evaluation

protocols.

add private method to enum to support replacing global constants with Enum members:
- search for candidate constants via supplied filter
- create new enum class and members
- insert enum class and replace constants with members via supplied module name
- replace __reduce_ex__ with function that returns member name, so previous Python versions can unpickle
modify IntEnum classes to use new method

add private method to enum to support replacing global constants with Enum members:
- search for candidate constants via supplied filter
- create new enum class and members
- insert enum class and replace constants with members via supplied module name
- replace __reduce_ex__ with function that returns member name, so previous Python versions can unpickle
modify IntEnum classes to use new method