checking for prime number, why does my output not include 2?

def is_prime(num):
    for i in range (2, num):
        if num % i == 0:
            return False
        else:
            return True
        

for i in range(1, 20):
    if is_prime(i + 1):
        print(i + 1, end=" ")
print()

I think it has something to do with the range function and value of 2 in the lower code?

expected output – 2 3 5 7 9 11 13 15 17 19

my output – 3 5 7 9 11 13 15 17 19

>Solution :

For is_prime(), when num = 2, the for loop is skipped entirely and the function returns None. None is a falsy value, so 2 is never printed.

Here is an is_prime() implementation that resolves this issue:

def is_prime(num):
    for i in range(2, num):
        if num % i == 0:
            return False
    return num != 1