[Python-Dev] Ancient use of generators

David Mertz mertz at gnosis.cx
Wed May 6 22:21:51 CEST 2015

I'm glad to see that everything old is new again.  All the stuff being
discussed nowadays, even up through PEP 492, was largely what I was trying
to show in 2002 .... the syntax just got nicer in the intervening 13 years

On Wed, May 6, 2015 at 10:57 AM, Guido van Rossum <guido at python.org> wrote:

> For those interested in tracking the history of generators and coroutines
> in Python, I just found out that PEP 342
> <https://www.python.org/dev/peps/pep-0342/> (which introduced
> send/throw/close and made "generators as coroutines" a mainstream Python
> concept) harks back to PEP 288 <https://www.python.org/dev/peps/pep-0288/>,
> which was rejected. PEP 288 also proposed some changes to generators. The
> interesting bit though is in the references: there are two links to old
> articles by David Mertz that describe using generators in state machines
> and other interesting and unconventional applications of generators. All
> these well predated PEP 342, so yield was a statement and could not receive
> a value from the function calling next() -- communication was through a
> shared class instance.
> http://gnosis.cx/publish/programming/charming_python_b5.txt
> http://gnosis.cx/publish/programming/charming_python_b7.txt
> Enjoy!
> --
> --Guido van Rossum (python.org/~guido)

Keeping medicines from the bloodstreams of the sick; food
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to the 21st century what the slave trade was to the 16th.
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