splitpath.py

import os

def splitpath(path):
    """
    splitpath(path) -> (drive, parts, isabs)
    
    Splits a path into its drive letter and path elements. If the OS
    does not use drive letters, \\c drive will always be an empty
    string. Note that on Windows, if a Unix-style absolute path is
    passed, an empty \\c drive letter will be returned but \\c isabs
    will be True.
    
    @param[in] path The path to split.
    @return A tuple of \\c (drive, parts, isabs)
    """

    drive = ''
    parts = []
    isabs = False

    if os.name == 'nt':
        if path.startswith('/'):
            isabs = True
        path = path.replace('/', os.sep)
    drive, path = os.path.splitdrive(path)

    # Remove any leading path separators.
    leadings = 0
    while path.startswith(os.sep):
        path = path[len(os.sep):]
        leadings += 1

    # Split until no end.
    while path:
        path, element = os.path.split(path)
        parts.insert(0, element)

    # If we're on windows and it had two or more leading
    # separators and no drive letters, it's a network drive.
    if os.name == 'nt':
        if leadings >= 2 and not drive and parts:
            drive = '\\\\' + parts.pop(0)

    if drive:
        isabs = True

    return drive, parts, isabs