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>>> for f in [b'/absolute/path/to/file',
... b'relative/path/to/file',
... b'file_alone',
... b'path/to/directory/',
... b'/multiple/path//separators',
... b'/file_at_root',
... b'///multiple_leading_separators_at_root',
... b'']:
... assert split(f) == posixpath.split(f), f
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>>> normcase(b'\xc3\x89')
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