Hecuba Filter creates 2 iterators, but only 1 used

[polsm91]

Given the following code:

filter(lambda x: x.key0 > 5, simple_dict.iteritems())

An iterator is created by the clause "simple_dict.iteritems()". Afterwards, the filter creates a second iterator with the restriction specified in the filtering clause "key0>5".

[adrianespejo]

In python, iteritems() and filter() create an iterator, so I think this is the way it should be. It will work using only simple_dict without iteritems(), the hecuba filter support both ways.
Anyway, how could simple_dict know that it will be the input of a filter? We could check the source code of the line, but I don't think it's necessary.