Robert Lehmann <lehman...@gmail.com> added the comment:

Your proposal seems two-fold: (a) make map/filter lazy and (b) have them as 
methods instead of functions.

It seems Tim borrowed Guido's time machine and already implemented (a) in 
Python 3.x, see http://docs.python.org/py3k/library/functions.html#map and 
http://docs.python.org/py3k/library/functions.html#filter.

Your second proposal-- which is better suited for python-ideas, really --is 
obstructed by iterators being merely a protocol (the next/__next__ method) 
which makes it hard to add those methods to one particular type. (This very 
discussion pops up every so often for str.join too.)

I'd recommend closing this issue.

----------
nosy: +lehmannro

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