Ming Hua <plateauw...@qq.com> added the comment:

Eryk Sun (eryksun) posted:
> Python's default can be overridden to UTF-8 for standard I/O via 
> PYTHONIOENCODING, or for all I/O via PYTHONUTF8 or "-X utf8=1".

FWIW, I did test with "-X utf8" option and it wasn't any better.  Just tested 
"python.exe -X utf8=1 -m test -W test_cmd_line_script" with 3.10.0 rc2 again, 
and got 6 errors and 2 failures this way (1 more error than without "-X 
utf8=1").  There is also this new error message:

0:00:01 [1/1] test_cmd_line_script
Warning -- Uncaught thread exception: UnicodeDecodeError
Exception in thread Thread-60 (_readerthread):
Traceback (most recent call last):
  File "C:\Programs\Python\python310\lib\threading.py", line 1009, in 
_bootstrap_inner
    self.run()
  File "C:\Programs\Python\python310\lib\threading.py", line 946, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Programs\Python\python310\lib\subprocess.py", line 1494, in 
_readerthread
    buffer.append(fh.read())
  File "C:\Programs\Python\python310\lib\codecs.py", line 322, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xbb in position 69: 
invalid start byte

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<https://bugs.python.org/issue45176>
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