Eryk Sun <eryk...@gmail.com> added the comment:
Supporting __fspath__ for os.environ[b] makes it consistent with POSIX
os.putenv, which already supports it via PyUnicode_FSConverter. For example:
os.putenv(Path('spam'), Path('eggs'))
getenv = ctypes.CDLL('libc.so.6').getenv
getenv.restype = ctypes.c_char_p
>>> getenv(b'spam')
b'eggs'
For symmetry, os.putenv in Windows could be updated to support __fspath__. An
old patch for bpo-28188 implements this, along with bytes support, via
PyUnicode_FSDecoder. But bytes support would be limited to UTF-8 strings, so it
wouldn't be as flexible as os.environb in POSIX, which supports arbitrary bytes
except for embedded nulls.
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nosy: +eryksun
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<https://bugs.python.org/issue39461>
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