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
diff --git a/Lib/lzma.py b/Lib/lzma.py
index 0817b87..c8b1970 100644
--- a/Lib/lzma.py
+++ b/Lib/lzma.py
@@ -302,6 +302,7 @@ def open(filename, mode="rb", *,
preset=preset, filters=filters)
if "t" in mode:
+ encoding = io.text_encoding(encoding)
return io.TextIOWrapper(binary_file, encoding, errors, newline)
else:
return binary_file