Make the producer.py file executable by running the following command: 
chmod +x producer.py
Run the producer by executing the following command: 
./producer.py
You should see output resembling this: 
Produced event to topic purchases: key = jbernard     value = alarm clock
Produced event to topic purchases: key = eabara       value = gift card
Produced event to topic purchases: key = jsmith       value = batteries
Produced event to topic purchases: key = sgarcia      value = alarm clock
Produced event to topic purchases: key = jsmith       value = book
Produced event to topic purchases: key = sgarcia      value = alarm clock
Produced event to topic purchases: key = awalther     value = batteries
Produced event to topic purchases: key = awalther     value = gift card
Produced event to topic purchases: key = awalther     value = book
Produced event to topic purchases: key = htanaka      value = book