The Tinify API allows you to compress and optimize JPEG and PNG images. Base on https://tinypng.com/developers/reference/python

tinypng.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys
import os
import getopt 

import tinify

tinify.key = 'YOUR_API_KEY'

def usage():
    print "python " + sys.argv[0] + " -i inputfile"

def tinypng(source):
    filepath = os.path.dirname(source)
    filename = os.path.basename(source)
    target = filepath + os.sep + "tiny-" + filename
    print target
    tinify.from_file(source).to_file(target)

def scandir(startdir):
    os.chdir(startdir)
    for obj in os.listdir(os.curdir):
        if os.path.isdir(obj):
            scandir(obj)
            os.chdir(os.pardir)
        else:
            filename = os.getcwd() + os.sep + obj
            fname=os.path.splitext(filename)
            if fname[1].lower() == ".png":
                tinypng(filename)


opts, args = getopt.getopt(sys.argv[1:], "(hH)i:", ["help", "input="])

input_file = ''

for op, value in opts:
    if op == "-i":
        input_file = value
    elif op == "-h":
        usage()
        sys.exit()

if len(sys.argv) != 3:
    usage()
    sys.exit()

if os.path.isdir(input_file):
    scandir(input_file)
else:
    tinypng(input_file)