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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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4
Python/sysmodule.c
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@ -2514,6 +2514,7 @@ static PyStructSequence_Field flags_fields[] = {
{"isolated", "-I"},
{"dev_mode", "-X dev"},
{"utf8_mode", "-X utf8"},
{"warn_default_encoding", "-X warn_default_encoding"},
{0}
};
@ -2521,7 +2522,7 @@ static PyStructSequence_Desc flags_desc = {
"sys.flags", /* name */
flags__doc__, /* doc */
flags_fields, /* fields */
15
16
};
static int
@ -2560,6 +2561,7 @@ set_flags_from_config(PyInterpreterState *interp, PyObject *flags)
SetFlag(config->isolated);
SetFlagObj(PyBool_FromLong(config->dev_mode));
SetFlag(preconfig->utf8_mode);
SetFlag(config->warn_default_encoding);
#undef SetFlagObj
#undef SetFlag
return 0;