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a Split a pathname into drive/UNC sharepoint and relative path specifiers.
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result = splitdrive(p)
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If the path contained a drive letter, drive_or_unc will contain everything
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If the path contained a UNC path, the drive_or_unc will contain the host name
and share up to but not including the fourth directory separator character.
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Paths cannot contain both a drive letter and a UNC path.
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r c C s, zt | }W n ttfy& Y dS 0 dS )zCTest whether a path exists. Returns True for broken symbolic linksFT)r: r_ r` ra re r5 r5 r6 r s
r )_getvolumepathnamec C st t | } t| }t| } t| \}}|rD|d |v rD| pB||v S ||v rPdS trl| |t| |kS dS dS )zaTest whether a path is a mount point (a drive root, the root of a
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