【python】TypeError: can only concatenate str (not “NoneType“) to str

problem ：TypeError: can only concatenate str (not "NoneType") to str

  reason ：

String can only splice strings

request_url = request_url + "?access_token=" + access_token

solve ： Use str Convert to string type

request_url = request_url + "?access_token=" + str(access_token)