Conversion: Decimal to Binary and Binary to Decimal

Conversion.py

# -*- coding: utf-8 -*-


def decimalToBinary(n):
    """ Return the binary representation
        of an Integer
        :param n An Integer
        :return A binary
     """
    if (n < 0):
        raise ValueError('The Integer n must be >= 0')
    result = ''
    while (n >= 1):
        result = str(n % 2) + result
        n = int(n / 2)
    return int(result)


def binaryToDecimal(n):
    """ Return the integer representation
        of an binary
        :param n A binary
        :return An Integer
     """
    if (n < 0):
        raise ValueError('The Integer n must be >= 0')
    result = 0
    string = str(n)
    for i in range(0, len(string)):
        result += int(string[i]) * 2 ** (len(string) - 1 - i)
    return result