Prime Factors

prime_factors.py

def is_prime(n):
    """Return True iff N is prime.
    >>> is_prime(1)
    False
    >>> is_prime(2)
    True
    >>> is_prime(8)
    False
    >>> is_prime(21)
    False
    >>> is_prime(23)
    True
    """
    return n > 1 and smallest_factor(n) == n

def smallest_factor(n):
    """Returns the smallest value k>1 that evenly divides N."""
    pass

def print_factors(n):
    """Print the prime factors of N.
    >>> print_factors(180)
    2
    2
    3
    3
    5
    """
    pass