老师代码如下，运行时报access_token错误，不知道哪里出错

import json
import requests
from flask import Flask, redirect, request

app = Flask(__name__)


def get_ticket():
    url = 'https://api.weibo.com/oauth2/authorize?client_id=1548116460&response_type=code&redirect_uri=http://test.baidu.com'
    # get请求
    return url


def get_token(code):
    url = 'https://api.weibo.com/oauth2/access_token?client_id=1548116460&client_secret=e7484b2aec003f14fd7a814f83366a5b&grant_type=authorization_code&redirect_uri=http://test.baidu.comI&code=' + code
    resp = requests.post(url)
    return resp.json()


def get_info(access_token, uid):
    url = 'https://api.weibo.com/2/users/show.json'
    resp = requests.get(url, {
        'access_token': access_token,
        'uid': uid
    })
    return resp.json()


@app.route('/')
def index():
    code = request.args.get('code', None)
    # 根据code获取token
    token = get_token(code)
    # 获取用户信息
    user_info = get_info(token['access_token'], token['uid'])
    return json.dumps(user_info)


@app.route('/weibo')
def weibo():
    t = get_ticket()
    return redirect(t)


if __name__ == '__main__':
    app.run(debug=True, port=80)