get relative path

get_relpath.py

#!/usr/bin/python
# -*- coding: UTF-8 -*-

import os
import sys, getopt

def get_relpath (target, start):
    t = os.path.dirname(target)
    s = os.path.dirname(start)
    b = os.path.basename(target)
    return os.path.join(os.path.relpath(t, s), b).replace('\\', '/')

def main():
    argv = sys.argv[1:]
    try:
        opts, args = getopt.getopt(argv,"ht:s:",["target=","start="])
    except getopt.GetoptError:
        print('test.py -t <target> -s <start>')
        sys.exit(2)
    for opt, arg in opts:
        if opt == '-t':
            target = arg
        if opt == '-s':
            start = arg
    print(get_relpath(target, start))

if __name__ == "__main__":
    main();