Python generator objects: __sizeof__()

Question

This may be a stupid question but I will ask it anyway. I have a generator object:

>>> def gen():
...     for i in range(10):
...         yield i
..         


        

Answer 1

As said in other answers, __sizeof__ returns a different thing.

Only some iterators have methods that return the number of not returned elements. For example listiterator has a corresponding __length_hint__ method:

>>> L = [1,2,3,4,5]
>>> it = iter(L)
>>> it

>>> it.__length_hint__()
5
>>> help(it.__length_hint__)
Help on built-in function __length_hint__:

__length_hint__(...)
    Private method returning an estimate of len(list(it)).

>>> it.next()
1
>>> it.__length_hint__()
4