python post

#!/usr/bin/python
# -*- coding: UTF-8 -*-
from hashlib import md5
import requests

image_path = 'image.png'     # 存放验证码图片地址
url = 'http://www.seemmark.com/external-api/external/captcha/v3'
key = '58f0a437e7798958a686bb33'    # 用户专属key


def signature(args, key):
    message = '&'.join(['='.join(item) for item in sorted(args.items())])
    message = '&'.join([message, key])
    return md5(message.encode('utf-8')).hexdigest()


def do_test(user_id):
    data = {
        'codeID': '1001adf11eefe',
        'userId': user_id,
    }
    image_file = open(image_path, 'rb')
    data['image'] = image_file.read().encode('base64') #读取图片用base64进行编码
    data['sign'] = signature(data, key)
    print data
    resp = requests.post(url, data=data)
    print resp.content
    image_file.close()
if __name__ == '__main__':
    image = open('image.png','rb')
    message =  image.read()
    print message
    print len(message)
    message =  image.read().encode('base64')
    # print message
    # print len(message)
    do_test('1234')