Calculate the largest number of zeros between ones in a binary number

binary_gap.py

def conver_to_binary(N):
        remainder = list()
        quotient = N // 2
        remainder.append(quotient%2)
        while quotient > 0:
            remainder.append(quotient%2)
            quotient = quotient // 2
        return remainder[::-1]
    binary = conver_to_binary(N)
    zeros = 0
    length = 0
    for value in binary:
        if value == 1:
            if zeros > length:
                length = zeros
            zeros = 0
        else:
            zeros += 1
    return length