I suggest adding a function which behaves like map but without returning anything to iterate over a generator.

This is useful in cases where you need to run a function on every element in a list without unnecessarily creating a generator object like map would. 

I think given the existence of the map function that this should be added to Python.

If I'm understanding correctly you want:

def xmap(f, iterable):
    for e in iterable:
        f(e)


Is that correct?

Exactly that was the plan!

I don't think something so obvious can be added, if you want a one liner you can write:

for e in iterable: f(e)

I think it would go in itertools if it were accepted.

If it won't be added do you reckon creating a library to solve this issue would be appropriate?

FWIW, you can already do this with map() and deque():

   deque(map(f, it), maxsize=0)