zabbix 钉钉机器人报警 提示错误

执行脚本./dd.py test test test报错如下：

Traceback (most recent call last):
File "./dd.py", line 4, in
import requests
File "/usr/lib/python2.7/site-packages/requests/init.py", line 133, in
from . import utils
File "/usr/lib/python2.7/site-packages/requests/utils.py", line 27, in
from . import certs
File "/usr/lib/python2.7/site-packages/requests/certs.py", line 15, in
from certifi import where
File "/usr/lib/python2.7/site-packages/certifi/init.py", line 1, in
from .core import contents, where
File "/usr/lib/python2.7/site-packages/certifi/core.py", line 17
def where() -> str:
^
SyntaxError: invalid syntax

脚本内容网络搜索的大致如下
#!/usr/bin/python
#coding:utf-8

import requests
import json
import sys
import os
import time

headers = {'Content-Type':'application/json;charset=utf-8'}
time=time.strftime("%Y-%m-%d %H:%M%S",time.localtime())

log_file = "var/log/dingding.log"
api_url = "我的机器人地址"
def log(info):
    if os.path.isfile(log_file) == False:
                f = open(log_file,'a+')

    f = open(log_file,'a+')
    f.write(info)
    f.close()

def msg(text,user):
    json_text={
    "msgtype":"markdown",
        "markdown":{
            "title":"Winy Frist test6.6",
            "text":text
        },
        "at":{
            "atMobiles":[
                user
],
            "isAtAll":True
        }
    }

    r= requests.post(api_url,data=json.dumps(json_text),headers=headers).json()
    code = r["errcode"]
    if code == 0:
        log(time + ":消息发送成功 返回码:" + str(code) + "\n")
    else:
        log(time + ":消息发送失败 返回码:" + str(code) + "\n")
        exit(3)

if __name__ == '__Main__':
    text = sys.argv[3]
    user = sys.argv[1]
    msg(text,user)

请大神指点一二，错误在哪里。