python-aiohttpHow to make parallel requests with Python Aiohttp?

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:

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

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