crossover.py

def crossover(dna1, dna2):

    # Sanity check.
    assert len(dna1) == len(dna2)

    # The child is now a copy of dna1.
    child = np.copy(dna1)
    
    # A random list of zeros and ones, signifying which
    # of the child's indices will become dna2 values (one)
    # and which of the indices will remain as dna1's
    # values (zero).
    dna2_indices = np.random.randint(2, size=child.size)
    indices = np.where(dna2_indices)
    
    # Transfer dna2 genetic material to child
    child[indices] = dna2[indices]
    return child