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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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1
Include/cpython/initconfig.h
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@ -153,6 +153,7 @@ typedef struct PyConfig {
PyWideStringList warnoptions;
int site_import;
int bytes_warning;
int warn_default_encoding;
int inspect;
int interactive;
int optimization_level;

1
Include/internal/pycore_initconfig.h
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@ -102,6 +102,7 @@ typedef struct {
int isolated; /* -I option */
int use_environment; /* -E option */
int dev_mode; /* -X dev and PYTHONDEVMODE */
int warn_default_encoding; /* -X warn_default_encoding and PYTHONWARNDEFAULTENCODING */
} _PyPreCmdline;
#define _PyPreCmdline_INIT \

1
Include/pyerrors.h
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@ -146,6 +146,7 @@ PyAPI_DATA(PyObject *) PyExc_FutureWarning;
PyAPI_DATA(PyObject *) PyExc_ImportWarning;
PyAPI_DATA(PyObject *) PyExc_UnicodeWarning;
PyAPI_DATA(PyObject *) PyExc_BytesWarning;
PyAPI_DATA(PyObject *) PyExc_EncodingWarning;
PyAPI_DATA(PyObject *) PyExc_ResourceWarning;