Request for elucidation: enhanced generators

Fredrik Lundh fredrik at
Wed Sep 20 14:44:16 CEST 2006

Ben Sizer wrote:

> But do you have an example of such a use case?

here's what I think is the first published example that uses "yield" for 
co-routine-like behaviour:

that snippet uses a generator to implement a simple network protocol. 
the generator yields a status code when it needs more data from the 
framework, and the framework uses an instance variable ( to 
pass information into the generator.

Python 2.5 lets you eliminate the instance variable; instead of using an 
external shared variable, the framework can use "send" to pass data into 
the generator, and the generator can use ordinary expression syntax to 
pick it up.


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