https://developers.weixin.qq.com/doc/offiaccount/Getting_Started/Getting_Started_Guide.html

原有的python2.7版有诸多问题：

1.print问题

2.map函数问题

3.web模块问题

4.认证的接口url 不是/wx 而是 /

在此改为python3+flask

# -*- coding: utf-8 -*-
# 微信公众号接口认证
import hashlib
import json

from flask import Flask, request

app = Flask(__name__)



@app.route('/', methods=['GET', 'POST'])
def wechat():
    if request.method == 'GET':
        # 这里改写你在微信公众平台里输入的token
        token = 'zhangchuanshuaigejavachuan'
        # 获取输入参数
        data = request.args
        signature = data.get('signature', '')
        timestamp = data.get('timestamp', '')
        nonce = data.get('nonce', '')
        echostr = data.get('echostr', '')
        # 字典排序
        list = [token, timestamp, nonce]
        list.sort()

        s = list[0] + list[1] + list[2]
        # sha1加密算法
        hascode = hashlib.sha1(s.encode('utf-8')).hexdigest()
        # 如果是来自微信的请求，则回复echostr
        if hascode == signature:
            return echostr
        else:
            return ""
if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000)