preprocessing.py

#getting the hexadecimal digits
def _getDecDigit(digit):
    digits = ['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f']
    for x in range(len(digits)):
        if digit.lower() == digits[x]:
            return(x)

#convert from hexadecimal to decimal      
def hexToDec(hexNum):
    decNum = 0
    power = 0
    
    for digit in range(len(hexNum), 0, -1):
        try:
            decNum = decNum + 16 ** power * _getDecDigit(hexNum[digit-1])
            power += 1
        except:
            return
    return(int(decNum))