def _abspath_split(path):    abs = abspath(normpath(path))    prefix, rest = splitunc(abs)    is_unc = bool(prefix)    if not is_unc:        prefix, rest = splitdrive(abs)    return is_unc, prefix, [x for x in rest.split(sep) if x]def relpath(path, start=curdir):    """Return a relative version of a path"""    if not path:        raise ValueError("no path specified")    start_is_unc, start_prefix, start_list = _abspath_split(start)    path_is_unc, path_prefix, path_list = _abspath_split(path)    if path_is_unc ^ start_is_unc:        raise ValueError("Cannot mix UNC and non-UNC paths (%s and %s)"                                                            % (path, start))    if path_prefix.lower() != start_prefix.lower():        if path_is_unc:            raise ValueError("path is on UNC root %s, start on UNC root %s"                                                % (path_prefix, start_prefix))        else:            raise ValueError("path is on drive %s, start on drive %s"                                                % (path_prefix, start_prefix))    # Work out how much of the filepath is shared by start and path.    i = 0    for e1, e2 in zip(start_list, path_list):        if e1.lower() != e2.lower():            break        i += 1    rel_list = [pardir] * (len(start_list)-i) + path_list[i:]    if not rel_list:        return curdir    return join(*rel_list)

def ownrelpath(a,b):    relpath = ‘‘;    la = a.split(‘/‘);    lb = b.split(‘/‘);    L = len(lb)-1;    tt = ‘‘;    for i in range(len(la)-1):        if la[i] == lb[i] and tt ==‘‘:            continue;        else:            tt = tt+la[i]+"\\";            relpath =  "..\\"*(L-1);    print(relpath+tt);