How to print the output of a generator [duplicate]

Question

When I run the code I get the following output

How do I print the print the output?

def firstn(n):
    num=0
    while num < n:
        yield num
        num=num+1


sum_of_first_n=sum(firstn(10))
print(firstn(3))

Answer 1

In general:

print(list(firstn(n)))

Be sure your generator is not infinite. If you are not sure, use something like:

import itertools as it

print(list(it.islice(firstn(n), 100)))

to print up to the first 100 elements.