Eryk Sun added the comment:
When writing to a file or pipe, cmd's internal commands default to either the
current codepage of the attached console or, for a detached process, the system
locale codepage. It uses a best-fit encoding that tries to map characters to
similar characters in the codepage. For example:
>>> win_unicode_console.enable()
>>> os.environ['TEST©'] = '®'
>>> out = subprocess.check_output('cmd /c set test')
>>> out.decode(sys.__stdout__.encoding).strip()
'TESTc=r'
You can force it to use Unicode (UTF-16LE) with the /u option:
>>> out = subprocess.check_output('cmd /u /c set test')
>>> out.decode('utf-16le').strip()
'TEST©=®'
subprocess could use "/u /c" instead of "/c". This would only affect the output
of internal shell commands such as "dir" and "set".
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nosy: +eryksun
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27048>
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