Binary to Decimal converstion

def bin_to_deci(num):
    
    i = 0
    full_dec = 0

    while num > 0:
        lst_digit = num % 10
        one_dec = lst_digit * (2 ** i)
        i += 1

        full_dec = full_dec + one_dec

        num = num // 10

    return full_dec


print(bin_to_deci(101101))