mirror of
https://github.com/Brandon-Rozek/website.git
synced 2024-11-13 20:27:29 -05:00
34 lines
No EOL
1.3 KiB
Markdown
34 lines
No EOL
1.3 KiB
Markdown
---
|
|
title: "Simple Async in Python with Gevent"
|
|
date: 2020-04-09T17:22:52-04:00
|
|
draft: false
|
|
tags: ["Python"]
|
|
medium_enabled: true
|
|
---
|
|
|
|
In my last post I spoke about [concurrency with asyncio](/blog/pyasyncio/). Now what if you don't want to concern yourself with async/await practices and just want to write synchronous code that executes I/O asynchronously? That's where the library [gevent](http://www.gevent.org/) comes in. It does this by modifying Python's standard library during runtime to call it's own asynchronous versions.
|
|
|
|
Last post code's example written in `gevent`.
|
|
|
|
```python
|
|
# The first two lines must be called before
|
|
# any other modules are loaded
|
|
import gevent
|
|
from gevent import monkey; monkey.patch_all()
|
|
|
|
import time
|
|
|
|
def think(duration):
|
|
print("Starting to think for " + str(duration) + " seconds...")
|
|
time.sleep(duration)
|
|
print("Finished thinking for " + str(duration) + " seconds...")
|
|
|
|
gevent.wait([
|
|
gevent.spawn(think, 5),
|
|
gevent.spawn(think, 2)
|
|
])
|
|
```
|
|
|
|
Notice that the function `think` is written the same as the synchronous version.
|
|
|
|
`gevent` is written on top of C libraries `libev` or `libuv` . This combined with the monkey patching can make `gevent` based applications hard to debug if something goes wrong. Otherwise it's a great tool to quickly take advantage of concurrency. |