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

Lib/test/exception_hierarchy.txt

diff --git a/Lib/test/exception_hierarchy.txt b/Lib/test/exception_hierarchy.txt
index 763a6c8..6c5e821 100644
--- a/Lib/test/exception_hierarchy.txt
+++ b/Lib/test/exception_hierarchy.txt
@@ -61,4 +61,5 @@
            +-- ImportWarning
            +-- UnicodeWarning
            +-- BytesWarning
+           +-- EncodingWarning
            +-- ResourceWarning