How to use WebSocket client in Python?

Melissa 40 Published: 11/08/2024

How to use WebSocket client in Python?

To use a WebSocket client in Python, you can leverage the websocket-client library. Here's a step-by-step guide on how to get started:

Install the websocket-client Library

You'll need to install the websocket-client library using pip:

pip install websocket-client

Basic Example: Connecting to a WebSocket Server

Here's an example of connecting to a WebSocket server and sending/receiving messages:

import asyncio

from websockets import connect


async def main():


uri = "ws://example.com/ws"  # Replace with your WebSocket endpoint


async with connect(uri) as ws:


await ws.send("Hello, world!")  # Send a message to the server

Receive messages from the server

while True:


message = await ws.recv()


print(f"Received: {message}")


asyncio.run(main())

In this example:

We import the connect function from websockets. We define an async function main() that connects to a WebSocket endpoint (uri) using the connect function. Inside the with statement, we send a message ("Hello, world!") to the server using ws.send(). We then enter an infinite loop where we receive messages from the server using ws.recv() and print them.

Advanced Example: Handling WebSocket Events

Let's say you want to handle specific events (e.g., "message" for new message arrivals) or exceptions:

import asyncio

from websockets import connect


async def main():


uri = "ws://example.com/ws"  # Replace with your WebSocket endpoint


async with connect(uri) as ws:


await ws.send("Hello, world!")  # Send a message to the server

Define event handlers

@ws.event_handler


async def on_message(message):


print(f"Received message: {message}")


@ws.error_handler


async def on_error(error):


print(f"Error occurred: {error}")


while True:


message = await ws.recv()


if message.startswith("message:"):  # Handle specific messages


on_message(message)


elif message == "exception":  # Handle exceptions


on_error(message)


asyncio.run(main())

Here, we:

Define two event handlers: on_message() for new messages and on_error() for errors. We then enter an infinite loop where we receive messages from the server using ws.recv(). For each message received: If it starts with "message:", we call our custom on_message() handler to process the message. If it's equal to "exception", we call our custom on_error() handler to handle the exception.

This is just a basic example of using WebSockets in Python. You can customize your client by handling different events, exceptions, and implementing more complex logic as needed.

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