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

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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
This commit is contained in:
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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Lib/test/test_embed.py
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@ -389,6 +389,7 @@ class InitConfigTests(EmbeddingTestsMixin, unittest.TestCase):
'site_import': 1,
'bytes_warning': 0,
'warn_default_encoding': 0,
'inspect': 0,
'interactive': 0,
'optimization_level': 0,