What determines the size of a generator?

Question

import sys

num_gen = (num for num in range(1))
print(sys.getsizeof(num_gen))
num_gen = (num for num in range(100))
print(sys.getsizeof(num_gen))

num_gen = (num+1 for num in range(100))
print(sys.getsizeof(num_gen))
num_gen = (num+1+1 for num in range(100))
print(sys.getsizeof(num_gen))
num_gen = (num+num for num in range(100))
print(sys.getsizeof(num_gen))
num_gen = (num+num+1 for num in range(100))
print(sys.getsizeof(num_gen))

OUTPUT

200
200
208
208
208
208

Why does the 4 generators below use 8 more bytes?

Answer 1

A generator object's "size" isn't a function of the elements it will produce (like a list or some other kind of sequence), but of the code it executes to, well, generate the elements.