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How to make parallel requests with Python Aiohttp?

// plain

Parallel requests with Python Aiohttp can be made using the asyncio library. The following example code shows how to make two requests in parallel:

import asyncio
import aiohttp

async def fetch(session, url):
    async with session.get(url) as response:
        return await response.text()

async def main():
    async with aiohttp.ClientSession() as session:
        html1 = await fetch(session, 'http://example.com/1')
        html2 = await fetch(session, 'http://example.com/2')
        print(html1)
        print(html2)

loop = asyncio.get_event_loop()
loop.run_until_complete(main())

Output example

<html>
  <head>
    <title>Example 1</title>
  </head>
  <body>
    <h1>Example 1</h1>
  </body>
</html>
<html>
  <head>
    <title>Example 2</title>
  </head>
  <body>
    <h1>Example 2</h1>
  </body>
</html>

The code consists of the following parts:

  1. import asyncio and import aiohttp: imports the asyncio and aiohttp libraries.
  2. async def fetch(session, url): defines an asynchronous function that takes a session and a URL as parameters and returns the response text.
  3. async def main(): defines an asynchronous function that makes two requests in parallel using the fetch function.
  4. loop = asyncio.get_event_loop(): creates an event loop.
  5. loop.run_until_complete(main()): runs the main function until it is complete.

Helpful links

group: aiohttp

onelinerhub: How to make parallel requests with Python Aiohttp?