Eryk Sun <[email protected]> added the comment:
Builtin open() calls C open(). This C function supports whatever path types are
supported natively. In Windows, C open() calls WinAPI CreateFileW(), which does
not support "file://" URIs. The Windows API handles it as a relative path,
which gets resolved against the current working directory. For example:
>>> os.getcwd()
'C:\\Temp'
>>> nt._getfullpathname('file:////host/share/file')
'C:\\Temp\\file:\\host\\share\\file'
>>> nt._getfullpathname('file://host/share/file')
'C:\\Temp\\file:\\host\\share\\file'
As to the resolved path somehow working, that generally will not be the case.
Most filesystems in Windows will reject a path component named "file:" as an
invalid name. The ":" character is usually disallowed in base file and
directory names, since some Windows filesystems use it as a delimiter in file
streams, e.g. "name:stream_name:stream_type". The default data stream in a
regular file has no stream name, and its stream type is "$DATA". Thus for base
name "file", the default data stream can be referenced explicitly as
"file::$DATA". But just "file:", with neither a stream name nor a stream type,
is an invalid name.
----------
nosy: +eryksun
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<https://bugs.python.org/issue46654>
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