Zillow University Test on HackerRank - Converting Hexadecimal values to 32-bit integers

hexadecimal_conversion_colors.py

'''
Jon
Zillow University Test
'''

def  css_string_to_color(colorString):
    if (colorString[0]!='#'):
        print("Error")
    else:
        if correctLength(colorString):
            print("Calculating:\n")
            hexa = colorString[1:]
            if len(hexa) == 3:
                double(hexa)
            conv(hexa)
        else:
            print("Error")


def correctLength(colorString):
    if (len(colorString) == 4) or (len(colorString) == 7):
        return True
    else:
        return False

def conv(hexa):
    list_of_alpha = ['a', 'b', 'c', 'd', 'e', 'f']
    add_list = []
    length = len(hexa)
    for i in range(length):
        char = hexa[i]
        lower_char = char.lower()
        power = length - i - 1
        if lower_char in list_of_alpha:
            for alpha in range(len(list_of_alpha)):
                if lower_char == list_of_alpha[alpha]:
                    integer_char = alpha + 10
        else:
            integer_char = int(hexa[i])
        decimal_version = integer_char*(16**power)
        print "\n"
        print(char, integer_char, power, decimal_version)
        print "\n"
        add_list.append(decimal_version)
    decimal = sum(add_list)
    print(add_list)
    return decimal

def double(hexa):
    str1 = ''
    for i in hexa:
        str1 = str1+i
        str1 = str1+i
    print(str1)


if __name__ == '__main__':
    css_string_to_color("#800080")
    css_string_to_color("oops")