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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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11
Modules/_io/textio.c
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@ -1123,6 +1123,17 @@ _io_TextIOWrapper___init___impl(textio *self, PyObject *buffer,
self->encodefunc = NULL;
self->b2cratio = 0.0;
if (encoding == NULL) {
PyInterpreterState *interp = _PyInterpreterState_GET();
if (_PyInterpreterState_GetConfig(interp)->warn_default_encoding) {
PyErr_WarnEx(PyExc_EncodingWarning,
"'encoding' argument not specified", 1);
}
}
else if (strcmp(encoding, "locale") == 0) {
encoding = NULL;
}
if (encoding == NULL) {
/* Try os.device_encoding(fileno) */
PyObject *fileno;