What happens when you "empty" a temporary data structure

Question

What happens when you "empty" a temporary data structure like a generator or the output of the itertools.product function?

from itertools import product, permutations

letters = ("A", "B")
p=product(letters, range(2))
for n in p:
print(n)

for n in p:
print(n)

The output of the for loop, instead of a list, is each tuple line-by-line. The output of the final print is an error in in the product function with a memory address.

with a list or set, popping out the values gives you [] or set()

Answer 1

itertools.product gives a generator, so once you have exhausted it, it just throws StopIteration, cutting the for loop.

Answer 2

@david that code worked finely in my interpreter!!

Answer 3

Would you ever get thrown and error?