def count_evens(start, end):
    'Returns the number of even numbers between start and end.'
    counter = start
    num_evens = 0
    while (counter <= end):
        if ((counter % 2) == 0):
            num_evens += 1
        counter += 1
    return num_evens
Returns the number of even numbers between start and end.
def count_evens(start, end):
    
    counter = start
    num_evens = 0
    while (counter <= end):
        if ((counter % 2) == 0):
            num_evens += 1
        counter += 1
    return num_evens