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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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GPG key ID: 4AEE18F83AFDEB23
32 changed files with 366 additions and 18 deletions
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7
Lib/tempfile.py
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@ -543,6 +543,9 @@ def NamedTemporaryFile(mode='w+b', buffering=-1, encoding=None,
if _os.name == 'nt' and delete:
flags |= _os.O_TEMPORARY
if "b" not in mode:
encoding = _io.text_encoding(encoding)
(fd, name) = _mkstemp_inner(dir, prefix, suffix, flags, output_type)
try:
file = _io.open(fd, mode, buffering=buffering,
@ -583,6 +586,9 @@ else:
"""
global _O_TMPFILE_WORKS
if "b" not in mode:
encoding = _io.text_encoding(encoding)
prefix, suffix, dir, output_type = _sanitize_params(prefix, suffix, dir)
flags = _bin_openflags
@ -638,6 +644,7 @@ class SpooledTemporaryFile:
if 'b' in mode:
self._file = _io.BytesIO()
else:
encoding = _io.text_encoding(encoding)
self._file = _io.TextIOWrapper(_io.BytesIO(),
encoding=encoding, errors=errors,
newline=newline)