[Python] Python generator objects: __sizeof__()

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
...
>>> obj=gen()


I can measure it's size:

>>> obj.__sizeof__()
24


It is said that generators get consumed:

>>> for i in obj:
... print i
...
0
1
2
3
4
5
6
7
8
9
>>> obj.__sizeof__()
24


...but obj.__sizeof__() remains the same.

With strings it works as I expected:

>>> 'longstring'.__sizeof__()
34
>>> 'str'.__sizeof__()
27


I would be thankful if someone could enlighten me.

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