The Pulsar Python client

The Pulsar Python client library is a wrapper over the existing C++ client library and exposes all of the same features. You can find the code in the python subdirectory of the C++ client code.

Installation

You can install the pulsar-client library either via PyPi, using pip, or by building the library from source.

Installation using pip

To install the pulsar-client library as a pre-built package using the pip package manager:

$ pip install pulsar-client

Installation via PyPi is available for the following Python versions:

Installing from source

To install the pulsar-client library by building from source, follow these instructions and compile the Pulsar C++ client library. That will also build the Python binding for the library.

To install the built Python bindings:

$ git clone https://github.com/apache/pulsar
$ cd pulsar/pulsar-client-cpp/python
$ sudo python setup.py install

API Reference

The complete Python API reference is available at api/python.

Examples

Below you’ll find a variety of Python code examples for the pulsar-client library.

Producer example

This creates a Python producer for the my-topic topic and send 10 messages on that topic:

import pulsar

client = pulsar.Client('pulsar://localhost:6650')

producer = client.create_producer('my-topic')

for i in range(10):
    producer.send(('Hello-%d' % i).encode('utf-8'))

client.close()

Consumer example

This creates a consumer with the my-subscription subscription on the my-topic topic, listen for incoming messages, print the content and ID of messages that arrive, and acknowledge each message to the Pulsar broker:

consumer = client.subscribe('my-topic', 'my-subscription')

while True:
    msg = consumer.receive()
    print("Received message '{}' id='{}'".format(msg.data(), msg.message_id()))
    consumer.acknowledge(msg)

client.close()

Reader interface example

You can use the Pulsar Python API to use the Pulsar reader interface. Here’s an example:

# MessageId taken from a previously fetched message
msg_id = msg.message_id()

reader = client.create_reader('my-topic', msg_id)

while True:
    msg = reader.receive()
    print("Received message '{}' id='{}'".format(msg.data(), msg.message_id()))
    # No acknowledgment