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python requests async get

Narkw Brahma

Narkw Brahma

• 2 min read

Python Requests Async Get

Python is a popular programming language that is widely used for web development. In web development, it is common to send HTTP requests to a web server in order to retrieve data. Python requests is a popular library for sending HTTP requests from Python.

What is Asynchronous Programming?

Async programming is a method of writing code that allows multiple tasks to be executed concurrently. This can greatly improve the performance of a program by allowing it to carry out several operations at once. In Python, async programming can be achieved using either the asyncio module or the aiohttp library.

Using Python Requests Async Get

The requests library supports async programming through the use of a separate library called grequests. Grequests extends the functionality of requests by allowing multiple requests to be made concurrently.

Here's an example of how to use Python requests async get:


import grequests

urls = [
    'http://www.example.com/page1',
    'http://www.example.com/page2',
    'http://www.example.com/page3'
]

# Send multiple requests asynchronously
response = grequests.map((grequests.get(url) for url in urls))

# Print the responses
for r in response:
    print(r.content)

In this example, we first create a list of URLs that we want to send our requests to. We then use a list comprehension to create a generator expression that creates a list of grequests objects that send a get request to each URL. We then pass this list to the grequests.map() method, which sends all the requests asynchronously and returns a list of response objects.

Using aiohttp Library for Async Requests

Another option for async programming in Python is to use the aiohttp library. This library provides a more complete set of tools for async web programming, including support for websockets and server-side events.

Here's an example of how to use aiohttp to send async get requests:


import aiohttp
import asyncio

async def get_request(url):
    async with aiohttp.ClientSession() as session:
        async with session.get(url) as response:
            return await response.text()

async def main():
    urls = [
        'https://www.example.com/page1',
        'https://www.example.com/page2',
        'https://www.example.com/page3'
    ]

    # Send multiple requests asynchronously
    tasks = [asyncio.ensure_future(get_request(url)) for url in urls]
    responses = await asyncio.gather(*tasks)

    # Print the responses
    for r in responses:
        print(r)

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

In this example, we first create an async function get_request() that sends a get request to a URL and returns the response text. We then define another async function main() that creates a list of URLs, creates a list of tasks that call the get_request() function for each URL, and then uses the asyncio.gather() method to run all the tasks concurrently and collect their results. Finally, we print the responses.

Conclusion

In conclusion, Python requests async get is a powerful technique for sending multiple HTTP requests concurrently. There are multiple libraries available for async programming in Python, including grequests and aiohttp. Grequests is a simple extension of the requests library that allows multiple requests to be sent asynchronously. Aiohttp is a more complete async web programming library that provides support for websockets and server-side events.

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