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Showing content from https://mail.python.org/pipermail/python-dev/2002-July/026567.html below:

[Python-Dev] Single- vs. Multi-pass iterability

[Python-Dev] Single- vs. Multi-pass iterability [Python-Dev] Single- vs. Multi-pass iterabilityGuido van Rossum guido@python.org
Mon, 15 Jul 2002 15:47:26 -0400
> > Maybe the xreadlines object could grow a flush() method that throws
> > away its buffer, and f.seek() could call that if there's a cached
> > xreadlines iterator?
> 
> Couldn't f.seek just decref the xreadlines object and put a NULL
> into f's pointer to the xreadlines object?

Well, that wouldn't help for code that's hanging on to the iterator.

I also just realized that having the file object point to the
xreadlines object creates a cycle, since the xreadlines object already
points to the file.  And neither participates in GC.  I guess the
xreadlines object could drop the pointer to the file once it's raised
StopIteration, as a way to ensure that this is a sink state.  Or we
could add GC support to file objects and xreadline objects (sigh).

--Guido van Rossum (home page: http://www.python.org/~guido/)




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