[Python] Why does this itertools function work outside another function but not inside?

I am trying to find all possible combinations using itertools product in Python. The code works but as soon as I try to yield my results instead of print them it only goes through one cycle or repetition, ignoring the repeat argument.

This works:

for i in range(1, 4):
g = itertools.product(range(5), repeat=i)
for j in range(len(al) ** i):
print(next(g))


This doesn't:

def func():
for i in range(1, 4):
g = itertools.product(range(5), repeat=i)
for j in range(len(al) ** i):
yield next(g)

for i in range(100):
print(next(func()))


I have tried playing with the next statements and putting the itertools function in various places. Google isn't very helpful as all results are just very basic itertools tutorials.

How can I make it work in a function?

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