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Live-coding a Python 3 async framework
This project forked from ajdavis/coroutines-demo
Live-coding a Python 3 async framework
How Do Python Coroutines Work? ============================== Script for live-coding an implementation of Python async coroutines analogous to asyncio.coroutine in the Python 3.4 standard library: https://pygotham.org/2015/talks/162/how-do-python-coroutines/ tornado.gen.coroutine is an earlier inspiration for the same idea. The example program is a "web crawler" that fetches only two URLs. Files are named in order. 10. The first version does a blocking fetch of the two URLs, one at a time. 20. Then it puts its sockets in non-blocking mode and uses an event loop and callbacks to connect asynchronously. Still fetches serially. 30. Add more callbacks to fetch asynchronously. 40. Add a "Future" to abstract callbacks. 50. Introduce "Task" and replace callbacks with generators. The combination of Task, Future, and generators is a coroutine implementation. To run the examples, first start server.py in a separate terminal session. (It requires Flask.) server.py is designed to be slow - each URL takes about a second to download. This provides a good example of async's strength suit. The material for this demo is adapted from a chapter I wrote with Guido van Rossum for an upcoming book in the Architecture of Open Source Applications series: https://github.com/aosabook/500lines/blob/master/crawler/crawler.markdown The chapter presents a far more sophisticated code example than is demo'ed here, and covers the relevant ideas in much greater depth and detail.
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