# coding:utf-8from hashlib import sha1from flask import Flask, requesttoken = 'xxxxxx'app = Flask(__name__)def get_update(token, timestamp, nonce):  arguments = ''  for k in sorted([token, timestamp, nonce]):    arguments = arguments + str(k)  m = sha1()  m.update(arguments.encode('utf8'))  return m.hexdigest()def check_signature():  signature = request.args.get('signature', '')  timestamp = request.args.get('timestamp', '')  nonce = request.args.get('nonce', '')  check = get_update(token, timestamp, nonce)  return True if check == signature else Falsedef parse_xml(data):  try:    import xml.etree.cElementTree as ET  except ImportError:    import xml.etree.ElementTree as ET    root = ET.fromstring(data)    datas = '<xml>'    for child in root:      if child.tag == 'ToUserName':        toUser = child.text        datas += '<FromUserName>%s</FromUserName>' % toUser      elif child.tag == 'FromUserName':        fromUser = child.text        datas += '<ToUserName>%s</ToUserName>' % fromUser      else:        datas += '<' + child.tag + '>'        datas += child.text        datas += '</' + child.tag + '>'    datas += '</xml>'    return datas@app.route('/weixin', methods=['GET', 'POST'])def weixinInterface():  if check_signature:    if request.method == 'GET':      echostr = request.args.get('echostr', '')      return echostr    elif request.method == 'POST':      data = request.data      msg = parse_xml(data)      return msg  else:    return 'signature error'if __name__ == '__main__':  app.run(host='0.0.0.0')