implement TextIOBase encoding attribute

Convert whats_left into a CPython script

Co-Authored-By: Jeong YunWon <[email protected]>

Fix: `range` beyond the isize range

* Check if start + step is greater than sys.maxsize

Refactor repetive optional range pattern to OptionalRangeArgs

Co-authored-by: 이정민(Jeong-Min Lee) <[email protected]>

Add `or`, `ror` and`ior` to `defaultdict`

Use macos-latest again for CI

update array.index for optional range

fix clippy warnings from test

Fix failure test_assign_del() in Lib/test/test_syntax.py

Now star expression can be a argumnet for del statement.

In CPython, group expression parse single yield and named expression, and handle invalid starred...

changes a short name of True, False, None from "keyword" to "True", "False", "None" themselves

Fix `float.__getformat__`

Add constants in `_winapi` module

add arrayiter.__reduce__

Update more tests

update signal and venv

Fix outdated test_userlist

Add ensurepip

Update multiple unittests from CPython 3.10.5

Add mappingproxy richcompare

Co-Authored-By: Hyunmin Shin <[email protected]>

Implement missing methods to `MappingProxy`

Co-Authored-By: Kim, Yeonwoo <[email protected]>

Add MappingProxy's get method implementation handling missing key

Unify elements referring to getset to `GetSet`

Add weakproxy richcompare

Co-Authored-By: Hyunmin Shin <[email protected]>

Update unittest from CPython 3.10.5