commit 4827483f47906fecee6b5d9097df2a69a293a85c
author Inada Naoki <songofacandy@gmail.com> Mon Mar 29 12:28:14 2021 +0900
committer GitHub <noreply@github.com> Mon Mar 29 12:28:14 2021 +0900
tree c4d7e34163e9583c06003d5335d020ce27aa4559
parent 261a452a1300eeeae1428ffd6e6623329c085e2c

bpo-43510: Implement PEP 597 opt-in EncodingWarning. (GH-19481)

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

Objects/exceptions.c

diff --git a/Objects/exceptions.c b/Objects/exceptions.c
index 88e2287..dfa069e 100644
--- a/Objects/exceptions.c
+++ b/Objects/exceptions.c
@@ -2465,6 +2465,13 @@ SimpleExtendsException(PyExc_Warning, BytesWarning,
 
 
 /*
+ *    EncodingWarning extends Warning
+ */
+SimpleExtendsException(PyExc_Warning, EncodingWarning,
+    "Base class for warnings about encodings.");
+
+
+/*
  *    ResourceWarning extends Warning
  */
 SimpleExtendsException(PyExc_Warning, ResourceWarning,
@@ -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);