Practical algorithms - Binary adder

binary_adder.py

def binaryAdder(arrayA,arrayB):
    arrayC = [0] * (len(arrayA) + 1)
    carry = 0
    for i in range(len(arrayA)-1,-1,-1):
        eA = arrayA[i]
        eB = arrayB[i]
        if eA == eB == 1:
            if carry == 1:
                arrayC[i+1] = 1
            else:
                carry = 1
                arrayC[i+1] = 0
        elif (eA == 0 and eB == 1) or (eA == 1 and eB == 0):
            if carry == 1:
                arrayC[i+1] = 0
                carry = 0
            else:
                arrayC[i+1] = 1
        else:
            arrayC[i+1] = carry
            carry = 0
        #print "{0},{1},{2}".format(eA,eB,arrayC[i+1])
    arrayC[0] = carry
    return arrayC

if __name__ == '__main__':
    print binaryAdder([1,0,1],[1,0,1])