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

Michael Zippo

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

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

[ update ]

Now I understand the cause of my difficulties. I"ve 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. David rocks.

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Julia Porretti

Berlin | 2023-01-27

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Angelo Jackson

Milan | 2023-01-27

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Javier Williams

Munchen | 2023-01-27

I was preparing for my coding interview, thanks for clarifying this - In practice, what are the main uses for the new “yield from” syntax in Python 3.3? in Python is not the simplest one. I just hope that will not emerge anymore