[Python-3000] map, filter, reduce

[Terry Reedy]

"Georg Brandl" <g.brandl at gmx.net> wrote in message 
news:f3prce$9c$1 at sea.gmane.org...
| How should an "ireduce" work? The result is not a sequence which could be
| returned lazily.

It would generate the sequence of partial reductions (potentially 
indefinately).
list(ireduce(summer, 0, range(5)) = [0, 1, 3, 6, 10]

This is obviously *not* the same as a reduce() which only returns the final 
value without the intermediate values.

Terry Jan Reedy