bpo-43510: Implement PEP 597 opt-in EncodingWarning. (GH-19481)

See [PEP 597](https://www.python.org/dev/peps/pep-0597/).

* Add `-X warn_default_encoding` and `PYTHONWARNDEFAULTENCODING`.
* Add EncodingWarning
* Add io.text_encoding()
* open(), TextIOWrapper() emits EncodingWarning when encoding is omitted and warn_default_encoding is enabled.
* _pyio.TextIOWrapper() uses UTF-8 as fallback default encoding used when failed to import locale module. (used during building Python)
* bz2, configparser, gzip, lzma, pathlib, tempfile modules use io.text_encoding().
* What's new entry
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Inada Naoki 2021-03-29 12:28:14 +09:00 committed by GitHub
parent 261a452a13
commit 4827483f47
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32 changed files with 366 additions and 18 deletions

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@ -583,6 +583,15 @@ PyConfig
Default: ``0``.
.. c:member:: int warn_default_encoding
If non-zero, emit a :exc:`EncodingWarning` warning when :class:`io.TextIOWrapper`
uses its default encoding. See :ref:`io-encoding-warning` for details.
Default: ``0``.
.. versionadded:: 3.10
.. c:member:: wchar_t* check_hash_pycs_mode
Control the validation behavior of hash-based ``.pyc`` files: