practice 5.2

gistfile1.txt

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

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