5.2 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. Enter the numbers from the book …

gistfile1.txt

largest = None
smallest = None
while True: 
    num = raw_input("Enter a number: ")
    if num == "done" : break
    try:
        num = int(num)
    except:
        print "Invalid input"
        continue
    
    if largest is None:
        largest = num
    elif num > largest:
        largest = num
    if smallest is None:
        smallest = num
    elif num < smallest:
        smallest = num
     

print "Maximum is", largest
print "Minimum is", smallest