验证路径有效性

import errno, os, sys
 
ERROR_INVALID_NAME = 123
 
def is_pathname_valid(pathname: str) -> bool:
    '''
    `True` if the passed pathname is a valid pathname for the current OS;
    `False` otherwise.
    '''
    # If this pathname is either not a string or is but is empty, this pathname
    # is invalid.
    try:
        if not isinstance(pathname, str) or not pathname:
            return False
 
        # Strip this pathname's Windows-specific drive specifier (e.g., `C:\`)
        # if any. Since Windows prohibits path components from containing `:`
        # characters, failing to strip this `:`-suffixed prefix would
        # erroneously invalidate all valid absolute Windows pathnames.
        _, pathname = os.path.splitdrive(pathname)
 
        root_dirname = os.environ.get('HOMEDRIVE', 'C:') \
            if sys.platform == 'win32' else os.path.sep
        assert os.path.isdir(root_dirname)
 
        # Append a path separator to this directory if needed.
        root_dirname = root_dirname.rstrip(os.path.sep) + os.path.sep
 
        for pathname_part in pathname.split(os.path.sep):
            try:
                os.lstat(root_dirname + pathname_part)
 
            except OSError as exc:
                if hasattr(exc, 'winerror'):
                    if exc.winerror == ERROR_INVALID_NAME:
                        return False
                elif exc.errno in {errno.ENAMETOOLONG, errno.ERANGE}:
                    return False
     
    except TypeError as exc:
        return False
     
    else:
        return True