python - Repeating a while loop after user input

I needed to create a program that sums the even numbers between 2 and 100. I have the part for this written:

def main():
    num = 2
    total = 0

    while num <= 100: 
        if num % 2 == 0:
            total = total + num
            num += 1
        else:
            num += 1
    print("Sum of even numbers between 2 and 100 is:", total)
main()

The next part is I'm supposed to add a while loop within the current while loop that asks for an input of Y/N and will repeat the program if the input is yes. I have spent a long time trying to put the following in different locations:

while again == "Y" or again == "y":
again = input("Would you like to run this again? (Y/N)")

But I haven't been able to get it to work or in best case I get it to print the total of the numbers and ask if I want to run it again but when I type yes it goes back to asking if I want to run it again.

Where do I put the other while statement?

Answer

I the while loop asking for running the program again does not have to be inside the loop computing the sum, then the following should answer your constraints:

def main():
    again = 'y'
    while again.lower() == 'y':
        num = 2
        total = 0
        while num <= 100:
            if num % 2 == 0:
                total = total + num

                num += 1
            else:
                num += 1
        print("Sum of even numbers between 2 and 100 is:", total)
        again = input("Do you want to run this program again[Y/n]?")

main()

Do note that if you answer N (no, or whatever else that is not Y or y) the program stops. It does not ask forever.