BETTER ASYNC CODE WITH PYTHON 3

Workshop on PyCon.Es, Valencia, 20.11.2015

Contains training tasks for making http requests: first in blocking way, then async using AsyncIO, and finally async using Tornado.

• Task description follows below
• Example solutions are in the code/ directory
• Feel free to extend, improve, send pull requests
• MIT-licence, everyone is free to reuse this workshop

REQUIREMENTS

• Python 3.4.1+
• aiohttp
• tornado
• pyvenv is a good idea

EXERCISE 1

1. Write a dummy minimal 'greeting' web-app that waits for one second and sends a greeting (eg Hola, Pycon) to the browser. Use any web-framework you like.

EXERCISE 2

1. Write a script that requests greeting from ex1 on your local web-server and prints it to shell. Use your favorite blocking http-library - requests, urllib, etc. Request time should result in around 1 second.

2. Modify your code to call the greeting-server of your neighbour. Delay should be a bit more then 1 second.

3. Modify your code to get greetings of 3 neighbours in a loop. Since requests are sequential, time would be more then 3 seconds.

EXERCISE 3

1-3. Do same tasks like in Ex.2, but with AsyncIO + aiohttp library.

EXERCISE 4

1-3. Do same tasks like in Ex.2, but with Tornado + tornado AsyncHTTPClient.

Example solutions are in the code/ directory.

Initial tutor/author: Anton