stackless python

Christian Tismer tismer at tismer.com
Sun Aug 4 03:48:15 CEST 2002


holger krekel wrote:
> Christian Tismer wrote:
> 
>>Neil Schemenauer wrote:
>>
>>>François Pinard wrote:
>>>
>>>
>>>>(My main question, maybe already answered in there -- I did not check yet
>>>>-- is how one proceeds to `yield' from within a nest of function calls,
>>>>and to later kludge resuming the function nesting sequence on `.next()'.)
>>>
>>>
>>>You can't since only one stack frame is saved per generator.  That's why
>>>one of the reasons they are called simple generators (two others being
>>>ease of implementation and of understanding).  You probably want to look
>>>at stackless Python if you haven't already.
>>
>>Btw., thanks for the generators! They made it quite easy for me to
>>create a "runnable frame" without having to deal with paramters
>>and such. Just create a temporary generator and peel the frame off :-)
>>
>>With the restriction of "pure python only", that means no method
>>calls, no cfunctions ...
> 
> 
> I can't see where you draw the line.  Obviously (c)functions are called 
> even for a 'str' call. Heck, anything calls something. Where do you
> draw the line? 

Hallo Holger :-)

there is a simple interface to generators, which are completely
pyfunction based. Allowing a generator to return "runnable"
has been a very small, single change to the interpreter.
What I mean is that it is easy to support this king of freedom
in a slightly extended manner, by making pyfunction calls
non-recursive.

All the other stuff is much much harder. But a patch for this one
would cost me two hours.

There wasn't anything else to claim that I thing this would be cheap,
and make the generators "full generators", as far as only pyfunction
calls are involved.

tia - chris

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