Close #11022: TextIOWrapper doesn't call locale.setlocale() anymore
open() and io.TextIOWrapper are now calling locale.getpreferredencoding(False)
instead of locale.getpreferredencoding() in text mode if the encoding is not
specified. Don't change temporary the locale encoding using locale.setlocale(),
use the current locale encoding instead of the user preferred encoding.
Explain also in open() documentation that locale.getpreferredencoding(False) is
called if the encoding is not specified.
diff --git a/Lib/_pyio.py b/Lib/_pyio.py
index f66290f..b684a9f 100644
--- a/Lib/_pyio.py
+++ b/Lib/_pyio.py
@@ -1448,7 +1448,7 @@
r"""Character and line based layer over a BufferedIOBase object, buffer.
encoding gives the name of the encoding that the stream will be
- decoded or encoded with. It defaults to locale.getpreferredencoding.
+ decoded or encoded with. It defaults to locale.getpreferredencoding(False).
errors determines the strictness of encoding and decoding (see the
codecs.register) and defaults to "strict".
@@ -1487,7 +1487,7 @@
# Importing locale may fail if Python is being built
encoding = "ascii"
else:
- encoding = locale.getpreferredencoding()
+ encoding = locale.getpreferredencoding(False)
if not isinstance(encoding, str):
raise ValueError("invalid encoding: %r" % encoding)