Erro ao publicar: ImportError: No module named 'paho'

Realizei os procedimentos conforme as aulas. Entretanto, ao rodar com o comando python3 arquivo.py, retorna o erro: ImportError: No module named 'paho'

import paho.mqtt.client as mqtt

mqttc = mqtt.Client()
mqttc.connect("iot.eclipse.org", 1883)
mqttc.publish("labcruz/temperatura", "25")
mqttc.loop(2)

retorno do comando pip list

diogo@dellbranco:~/Arduino$ pip list adium-theme-ubuntu (0.3.4) beautifulsoup4 (4.4.1) chardet (2.3.0) html5lib (0.999) lxml (3.5.0) paho-mqtt (1.4.0) pip (8.1.1) pygobject (3.20.0) setuptools (20.7.0) six (1.10.0) unity-lens-photos (1.0) wheel (0.29.0)

Obrigado!