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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
Objects/exceptions.c
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@ -2464,6 +2464,13 @@ SimpleExtendsException(PyExc_Warning, BytesWarning,
"related to conversion from str or comparing to str.");
/*
* EncodingWarning extends Warning
*/
SimpleExtendsException(PyExc_Warning, EncodingWarning,
"Base class for warnings about encodings.");
/*
* ResourceWarning extends Warning
*/
@ -2592,6 +2599,7 @@ _PyExc_Init(PyInterpreterState *interp)
PRE_INIT(BufferError);
PRE_INIT(Warning);
PRE_INIT(UserWarning);
PRE_INIT(EncodingWarning);
PRE_INIT(DeprecationWarning);
PRE_INIT(PendingDeprecationWarning);
PRE_INIT(SyntaxWarning);
@ -2731,6 +2739,7 @@ _PyBuiltins_AddExceptions(PyObject *bltinmod)
POST_INIT(BufferError);
POST_INIT(Warning);
POST_INIT(UserWarning);
POST_INIT(EncodingWarning);
POST_INIT(DeprecationWarning);
POST_INIT(PendingDeprecationWarning);
POST_INIT(SyntaxWarning);