def isEven(n):
    '''return True if n is even; return False otherwise
       Precondition: n is an int
    '''
    return n % 2 == 0

n = 3
m = 4
print "Evenness"
print "********"
print n, isEven(n)
print m, isEven(m)

def isPrime(n):
    """returns True if n is prime, returns False otherwise
       Precodition: n is a positive int
    """
    if n == 1:
        return False
    for d in range(2, n):
        if n % d == 0:
            return False
    return True

def isComposite(n):
    """returns True if n is composite, returns False otherwise
       Precodition: n is a positive int
    """
    return n != 1 and not isPrime(n)

print "\nPrimality"
print "*********"
for n in range(1, 20):
    print n, isPrime(n)

print "\nCompositeness"
print "*************"
for n in range(1, 20):
    print n, isComposite(n)