PEP 322: Reverse Iteration (REVISED, please comment)

[Werner Schiendl]

Raymond Hettinger wrote:

> 
> Discussions with Guido made it clear that inreverse() will not be extended
> to cover all iterables.  The proposal is about simplicity, expression, and
> performance.  As such, it would be counter-productive to take in a general
> iterable, run it to completion, save the data in memory, and then iterate
> over the data in reverse.
> 

Which of course can easily be done explicitely:

# Make some iterable unsuitable for inreverse
a = iter("Hello")

# Create a list that can be in'reversed explicitely
for i in inreverse(list(a)):
     print i


As always, explicit is better than implicit ;-)

Maybe something alike should go into the docs...


- Werner