74 lines
2.0 KiB
Markdown
74 lines
2.0 KiB
Markdown
---
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title: "Python: How to load multiple web pages in parallel"
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date: 2022-05-15
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---
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This article describes how to load the content of multiple web pages from multiple urls in parallel with python.
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<!--more-->
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## Step 1. Installation of aiohttp
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First you need to install an aiohttp package. To install aiohttp run the command:
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```bash
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pip install aiohttp[speedups]
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```
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The `[speedups]` suffix is needed to install aiohttp accelerating packages - aiodns and cchardet.
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## Step 2. Creation of a script
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Then create a main.py file with this code:
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```python
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import aiohttp
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import asyncio
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import socket
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async def fetch_urls(urls):
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resolver = aiohttp.AsyncResolver()
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connector = aiohttp.TCPConnector(resolver=resolver, family=socket.AF_INET, use_dns_cache=False)
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session = aiohttp.ClientSession(connector=connector)
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async def fetch_url(url, session):
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async with session.get(url) as resp:
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print(resp.status)
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print(await resp.text())
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tasks = [fetch_url(url, session) for url in urls]
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await asyncio.gather(*tasks)
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await session.close()
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loop = asyncio.get_event_loop()
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urls = ['http://httpbin.org/get?key=value1', 'http://httpbin.org/get?key=value2', 'http://httpbin.org/get?key=value3']
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loop.run_until_complete(fetch_urls(urls))
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```
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Now you can run main.py file with the command:
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```bash
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python3 main.py
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```
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You will see this output:
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```
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200
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{
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"args": {
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"key": "value2"
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},
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"headers": {
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"Accept": "*/*",
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"Accept-Encoding": "gzip, deflate",
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...
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```
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All three queries will be executed in parallel. You can add any urls to the `urls` list, for example:
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```python
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urls = ['https://yandex.com', 'https://google.com', 'https://yahoo.com']
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```
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In order to make HEAD, POST, PUT, DELETE requests, just replace `session.get(url)` in your code with the appropriate method:
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```python
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session.post('http://httpbin.org/post', data=b'data')
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session.put('http://httpbin.org/put', data=b'data')
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session.delete('http://httpbin.org/delete')
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session.head('http://httpbin.org/get')
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session.options('http://httpbin.org/get')
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session.patch('http://httpbin.org/patch', data=b'data')
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``` |