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Dave Klein

Developer Advocate

Use Producer to Send Events to Kafka

In this exercise, you will use the Producer class to write events to a Kafka topic.

Create Topics

  1. In the Confluent Cloud Console, navigate to the Topics page for the kafka-python cluster in the learn-kafka-python environment.
  2. Create a new topic called hello_topic, with 6 partitions and defaults settings.

Project Setup

  1. Open a terminal window and navigate to the kafka-python directory that you created in the previous exercise.

  2. If you are not currently using the kafka-env environment that was created in the last exercise, switch to it with the following command:

    source kafka-env/bin/activate
  3. Create a file called

  4. Open in an IDE of your choice.

Add Required Imports

  1. Add the following import statements to the top of the file:

    from confluent_kafka import Producer
    from config import config

Create callback function

  1. Create a function called callback() that can be passed to the produce() method.

    def callback(err, event):
        if err:
            print(f'Produce to topic {event.topic()} failed for event: {event.key()}')
            val = event.value().decode('utf8')
            print(f'{val} sent to partition {event.partition()}.')

Create function to produce to hello_topic

  1. Create a function called say_hello() that takes a producer and a key.

    def say_hello(producer, key):
        value = f'Hello {key}!'
        producer.produce('hello_topic', value, key, on_delivery=callback)

Add Main Block

  1. Add the following main block that will pull this all together

    if __name__ == '__main__':
        producer = Producer(config)
        keys = ['Amy', 'Brenda', 'Cindy', 'Derrick', 'Elaine', 'Fred']
        [say_hello(producer, key) for key in keys]

Run the Program

  1. Execute the program by running the following command


    Notice how the different names, which we are using for keys, result in specific partition assignments. To get a better idea of how this works, you can try changing some of the names and see how the partition assignment changes.

    For a good explanation of partitions and partition assignments, please refer to the Kafka 101 course on Confluent Developer.

Use the promo code PYTHONKAFKA101 to get $25 of free Confluent Cloud usage

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