Question

我对所有这些都很陌生，因此有可能我遗漏了一些明显的东西。我已经搜索了所有内容，但看不到我错了的地方。

我正在尝试使用Python连接到我在Raspberry Pi 3上运行的Mosquitto代理。我使代理运行并使用Mosquitto-Client工具进行了测试。当我尝试运行Python脚本时，出现以下错误：

  File "mqtt_sub.py", line 20
    client = mqtt.Client()
SyntaxError: invalid syntax

这是我的mqtt_sub.py脚本：

import paho.mqtt.client as mqtt

# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, flags, rc):
    print("Connected with result code "+str(rc))

    # Subscribing in on_connect() - if we lose the connection and
    # reconnect then subscriptions will be renewed.
    client.subscribe("Kastor/#")
    #client.subscribe("<MainTopic/SubTopic>") # Add additional subscriptions here.

# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):
    print(msg.topic+" "+str(msg.payload))

    if msg.topic == "Kastor/event/PrintDone":
        print(msg.payload["name"] + " has finsihed printing in " + int(msg.payload["time"] + "seconds.")

# Create an MQTT client and attach our routines to it.
client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message

client.username_pw_set(”myUsername”, ”myPassword”)
client.connect("localhost", 1883, 60)

client.loop_forever()

我在运行脚本的Pi上安装了Python 2.7.9。如果我还有其他信息可以帮助您进行故障排除，请告诉我。

Answer 1

与所有明确正确的行弹出SyntaxError的情况一样，您的错误出在前一行：

print(msg.payload["name"] + " has finsihed printing in " + int(msg.payload["time"] + "seconds.")

计算括号。

在Python Paho-MQTT中使用client = mqtt.Client（）时出现SyntaxError

1 个答案: