Base 2 to Base 10 and Base 10 to Base 16 interger conversion

binary_decimal_hexadecimal.py

BASE_16 = 16
HEXADECIMAL_CHARACTERS = [
    0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
    'A', 'B', 'C', 'D', 'E', 'F',
]

DECIMAL_TO_HEXADECIMAL_MAPPING = {
    x: HEXADECIMAL_CHARACTERS[x]
    for x in range(len(HEXADECIMAL_CHARACTERS))
}

def decimal_to_hexadecimal(decimal):
    if decimal <= 255:
        prefix = str(DECIMAL_TO_HEXADECIMAL_MAPPING[decimal/BASE_16])
        suffix = str(DECIMAL_TO_HEXADECIMAL_MAPPING[decimal%BASE_16])
    else:
        prefix = decimal_to_hexadecimal(decimal/256)
        suffix = decimal_to_hexadecimal(decimal%256)
    return prefix + suffix

def bitstring_to_integer(bitstring):
    bitstring = bitstring[::-1]

    total = 0
    for i in range(len(bitstring)):
        total += long(bitstring[i]) * (2**i)
    return int(total)

# 0 - 15 in binary
inputs = [
    '0000', '0001', '0010', '0011',
    '0100', '0101', '0110', '0111',
    '1000', '1001', '1010', '1011',
    '1100', '1101', '1110', '1111',
]

map(bitstring_to_integer, inputs)
map(decimal_to_hexadecimal, map(bitstring_to_integer, inputs))
bitstring_to_integer('10000000000000000')
# 65536

decimal_to_hexadecimal(bitstring_to_integer('10000000000000000'))
# '010000'