Decimal to Binary Converter

"""
Converts a decimal number to a binary number.

February 18th, 2019. Sébastien Lavoie
"""

def dec_to_bin(number):
    """Algorithm that converts a decimal number to a binary number.

Receives an integer and returns a string."""

if number == 0:  # if number is 'zero', the answer is 'zero'
        return 0

remainders = []  # list that stores the remainders

# iterate over the initial given decimal and divide it by two
    # until it gets to 'zero'. At each step, add the remainder in
    # the above list
    while number > 0:
        remainders.append(number % 2)
        number = number // 2

# reverse the list of remainders, as the first remainder is the
    # right most digit in the answer
    remainders.reverse()

# concatenate all the digits from the list of remainders from left
    # to right to display the final binary number
    answer = ''
    for digit in remainders:
        answer += str(digit)

# give the answer back to the script
    return answer

if __name__ == '__main__':
    # retrieve decimal number from input as integer
    DEC_NUM = int(input())

# pass decimal number to algorithm and store the result
    RESULT = dec_to_bin(DEC_NUM)

# print the solution to the console
    print(RESULT)

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