bin2dec oct2dec hex2dec

from functools import partial


def _2dec(value: str, charset: str) -> int:
    base = len(charset)
    result = 0
    charset = charset.lower()

    for index, char in enumerate(value.lower()):
        result += charset.index(char) * base ** index

    return result


bin2dec = partial(_2dec, charset="01")
oct2dec = partial(_2dec, charset="01234567")
hex2dec = partial(_2dec, charset="0123456789ABCDEF")