In practice, what are the main uses for the "yield from" syntax in Python 3.3?

I'm having a hard time wrapping my brain around PEP 380.

  1. What are the situations where yield from is useful?
  2. What is the classic use case?
  3. Why is it compared to micro-threads?

So far I have used generators, but never really used coroutines (introduced by PEP-342). Despite some similarities, generators and coroutines are basically two different concepts. Understanding coroutines (not only generators) is the key to understanding the new syntax.

IMHO coroutines are the most obscure Python feature, most books make it look useless and uninteresting.

Thanks for the great answers, but special thanks to agf and his comment linking to David Beazley presentations.

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