Eryk Sun <eryk...@gmail.com> added the comment:
This is standard Windows API behavior for the final path component. A single
dot component means the current directory. Two dots means the parent directory.
More than two dots and/or trailing spaces, gets reduced to a single dot,
meaning the current directory. For example:
>>> os.path.abspath('.')
'C:\\Temp'
>>> os.path.abspath('..')
'C:\\'
>>> os.path.abspath('...')
'C:\\Temp'
>>> os.path.abspath('... ... ...')
'C:\\Temp'
Specifically, os.path.isdir is implemented as nt._isdir, which calls WinAPI
GetFileAttributes to check for FILE_ATTRIBUTE_DIRECTORY, which in turn calls
the NT system function NtQueryAttributesFile.
GetFileAttributes has to translate the DOS path to an NT kernel path. In the
kernel, none of this "." business exists. The kernel doesn't even have a
concept of a working directory. Depending on your Windows version, it might
call the runtime library function RtlDosPathNameToNtPathName_U_WithStatus to
convert the path to a native OBJECT_ATTRIBUTES record. The first step is to
normalize the path via RtlGetFullPathName_Ustr, which is what the Windows API
GetFullPathName function calls like in the above abspath() examples.
----------
nosy: +eryksun
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<https://bugs.python.org/issue31716>
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