AttributeError：'NoneType'對象沒有屬性'訂閱'

我試圖使用代碼來發送帖子給經紀人，並且我遇到了一些問題。代碼如下：AttributeError：'NoneType'對象沒有屬性'訂閱'

import paho.mqtt.client as mqtt 
def on_connect(self, client, userdata, rc): 
    if rc==0: 
    print("successful connection") 
    client.subscribe("HelloWorld") 
else: 
    print("connection fail") #the subscriber will not receive the message 

def on_message (client, userdata, msg): 
print(str(msg.payload.decode('UTF-8'))) #Post Posted 

client= mqtt.Client() 
client.on_connect = on_connect #Create the "client" object 
client.on_message = on_message 
client.username_pw_set("TypeUser",typePassaword) # I omitted username and password 
client.connect('TypeURLBroker',TypePort) #Broker Online. 1º Termo: Url do broker; 2º Termo: Port 
client.loop_start() 

while 0==0: 
mymsg='Hello World' 
client.publish(topic='HelloWorld/', payload=mymsg)

出現一些錯誤，我沒有任何想法來解決它們。我需要一點幫助。

錯誤列表：

successful connection 
Exception in thread Thread-6: 
Traceback (most recent call last): 
File "C:\Users\fvs\AppData\Local\Programs\Python\Python35\lib\threading.py", line 914, in _bootstrap_inner 
    self.run() 
    File "C:\Users\fvs\AppData\Local\Programs\Python\Python35\lib\threading.py", line 862, in run 
    self._target(*self._args, **self._kwargs) 
    File "C:\Users\fvs\AppData\Local\Programs\Python\Python35\lib\site-packages\paho\mqtt\client.py", line 2606, in _thread_main 
    self.loop_forever(retry_first_connection=True) 
    File "C:\Users\fvs\AppData\Local\Programs\Python\Python35\lib\site-packages\paho\mqtt\client.py", line 1470, in loop_forever 
    rc = self.loop(timeout, max_packets) 
    File "C:\Users\fvs\AppData\Local\Programs\Python\Python35\lib\site-packages\paho\mqtt\client.py", line 995, in loop 
    rc = self.loop_read(max_packets) 
    File "C:\Users\fvs\AppData\Local\Programs\Python\Python35\lib\site-packages\paho\mqtt\client.py", line 1273, in loop_read 
    rc = self._packet_read() 
    File "C:\Users\fvs\AppData\Local\Programs\Python\Python35\lib\site-packages\paho\mqtt\client.py", line 1838, in _packet_read 
    rc = self._packet_handle() 
    File "C:\Users\fvs\AppData\Local\Programs\Python\Python35\lib\site-packages\paho\mqtt\client.py", line 2291, in _packet_handle 
    return self._handle_connack() 
    File "C:\Users\fvs\AppData\Local\Programs\Python\Python35\lib\site-packages\paho\mqtt\client.py", line 2349, in _handle_connack 
    self.on_connect(self, self._userdata, flags_dict, result) 
    File "C:/Users/fvs/PycharmProjects/HelloWorld.py", line 6, in on_connect 
    client.subscribe("HelloWorld") 
AttributeError: 'NoneType' object has no attribute 'subscribe'

來源

2017-10-28 Fábio Schreiber

根據docson_connect應該有下面的簽名

on_connect(client, userdata, flags, rc)

您嘗試使用第二個位置參數，這實際上userdata，不client。嘗試

def on_connect(client, userdata, flags, rc): 
    if rc==0: 
     print("successful connection") 
     client.subscribe("HelloWorld") 
    else: 
     print("connection fail") #the subscriber will not receive the message

來源

2017-10-28 17:38:50 kvorobiev

它的工作，非常感謝。 –

@FábioSchreiber不客氣）如果答案有幫助，你可以將其標記爲正確的答案。 – kvorobiev

AttributeError：'NoneType'對象沒有屬性'訂閱'

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