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From: Neal Becker <ndbecker2@gmail.com>
Subject: writable iterators?
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Date: Wed, 22 Jun 2011 15:28:23 -0400
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:8241

AFAICT, the python iterator concept only supports readable iterators, not write.  
Is this true?

for example:

for e in sequence:
  do something that reads e
  e = blah # will do nothing

I believe this is not a limitation on the for loop, but a limitation on the 
python iterator concept.  Is this correct?