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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def _resolve_symlink(path, max_depth=64):
    '''
    Resolves the given symlink path to its real path, up to a maximum of the
    `max_depth` parameter which defaults to 64.

    If the path is not a symlink path, it is simply returned.
    '''
    if sys.getwindowsversion().major < 6:
        raise SaltInvocationError('Symlinks are only supported on Windows Vista or later.')

    # make sure we don't get stuck in a symlink loop!
    paths_seen = set((path, ))
    cur_depth = 0
    while is_link(path):
        path = readlink(path)
        if path in paths_seen:
            raise CommandExecutionError('The given path is involved in a symlink loop.')
        paths_seen.add(path)
        cur_depth += 1
        if cur_depth > max_depth:
            raise CommandExecutionError('Too many levels of symbolic links.')

    return path