[Tornado][tornado] app demonstrating asynchronous IO, processing data 
from remote resource and @tornado.web.asynchronous decorator.
Shows current air temperature for Moscow, Russia.
In no way I encourage using regexes to parse HTML; just imagine there some 
magic instead.
One of the older demos.
Complexity: ★★☆☆☆
Requirements
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Python (2 or 3), [Tornado][tornado], browser.
Effects
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- Fetching data doesn't block the entire app, so you can open multiple tabs 
  and F5 them all at once, the app will send multiple requests in parallel.
- Demonstrates a way to process data in Tornado when using asynchronous IO 
  (via callbacks).
[tornado]: http://www.tornadoweb.org/