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The Paho Python Client provides a client class with support for both MQTT v3.1 and v3.1.1 on Python 2.7 or 3.x. It also provides some helper functions to make publishing one off messages to an MQTT server very straightforward.

Source

http://git.eclipse.org/c/paho/org.eclipse.paho.mqtt.python.git/

Download

The Python client can be downloaded and installed from PyPI using the pip tool:

pip install paho-mqtt

Building from source

The project can be installed from the repository as well. To do this:

. 
git clone http://git.eclipse.org/gitroot/paho/org.eclipse.paho.mqtt.python.git
cd org.eclipse.paho.mqtt.python.git
python setup.py install

The final step may need to be run with sudo if you are using Linux or similar system.

Documentation

Getting Started

There are example clients in the examples directory of the repository.

Here is a very simple example that subscribes to the broker $SYS topic tree and prints out the resulting messages:

import paho.mqtt.client as mqtt

# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, rc):
    print("Connected with result code "+str(rc))
	# Subscribing in on_connect() means that if we lose the connection and
	# reconnect then subscriptions will be renewed.
	client.subscribe("$SYS/#")

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

client = mqtt.Client()
client._on_connect_ = on_connect
client._on_message_ = on_message

client.connect("iot.eclipse.org", 1883, 60)

# Blocking call that processes network traffic, dispatches callbacks and
# handles reconnecting.
# Other loop*() functions are available that give a threaded interface and a
# manual interface.
client.loop_forever()