[Basic] Control Flow in Python assignment

[BashBedlam]

I tried the first example. The code I entered produced the correct result when run in my system but produced errors when run in you online interpreter. Here's my code:

# Move this code into a function `is_prime(test_num)`
def is_prime(test_num):
    num = 2
    test_num_is_prime = True
    while num <= float(test_num / 2):
        if test_num % num == 0:
            test_num_is_prime = False
            break
        num += 1
    if test_num_is_prime:
        print("%d is prime" % test_num)
    else:
        print("%d is not prime" % test_num)

# Input handling, do not modify below this line
is_prime(int(input()))