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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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9
Python/preconfig.c
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@ -169,6 +169,7 @@ _PyPreCmdline_SetConfig(const _PyPreCmdline *cmdline, PyConfig *config)
COPY_ATTR(isolated);
COPY_ATTR(use_environment);
COPY_ATTR(dev_mode);
COPY_ATTR(warn_default_encoding);
return _PyStatus_OK();
#undef COPY_ATTR
@ -257,9 +258,17 @@ _PyPreCmdline_Read(_PyPreCmdline *cmdline, const PyPreConfig *preconfig)
cmdline->dev_mode = 0;
}
// warn_default_encoding
if (_Py_get_xoption(&cmdline->xoptions, L"warn_default_encoding")
|| _Py_GetEnv(cmdline->use_environment, "PYTHONWARNDEFAULTENCODING"))
{
cmdline->warn_default_encoding = 1;
}
assert(cmdline->use_environment >= 0);
assert(cmdline->isolated >= 0);
assert(cmdline->dev_mode >= 0);
assert(cmdline->warn_default_encoding >= 0);
return _PyStatus_OK();
}