[Python] How to divert data in an iterator into two others?

I know that I can copy an iterator using

x1, x2 = itertools.tee(x)

Then, in order to get two generators, I could filter:

filter(..., x1); filter(..., x2)

However, then I would run the same computation twice, i.e. go through x in x1 and x2.

Thus, I would do something more efficient like that:

x1, x2 = divert(into x1 if ... else x2, x)

Does anything like this exist in python 3?

Continue reading...