Find Largest and Smallest numbers Among User Input Numbers

Write a program that repeatedly prompts a user for integer numbers until the user enters 'done'. Once 'done' is entered, print out the largest and smallest of the numbers. If the user enters anything other than a valid number catch it with a try/except and put out an appropriate message and ignore the number.

largest = None

smallest = None

while True:

    try:

        num = input("Enter a number: ")

        if num == "done":

            break

        num = int(num)

        if largest is None:

            largest = num

        elif num > largest:

            largest = num

        if smallest is None:

            smallest = num

        elif num < smallest:

            smallest = num

    except:

        print("Invalid input")

print("Maximum is", largest)

print("Minimum is", smallest)