RGB/HEX

def rgb_hex():
    invalid_msg = "Something went wrong. Check your response."
    
    red = int(raw_input("What is the RED value? "))
    if ((red < 0) or (red > 255)):
        print invalid_msg
        return
    
    green = int(raw_input("What is the GREEN value? "))
    if ((green < 0) or (green > 255)):
        print invalid_msg
        return
    
    blue = int(raw_input("What is the BLUE value? "))
    if ((blue < 0) or (blue > 255)):
        print invalid_msg
        return
    
    val = (red << 16) + (green << 8) + (blue)
    print "%s" % (hex(val)[2:]).upper()

def hex_rgb():
    hex_val = raw_input("What is the HEX value? ")
    
    if len(hex_val) != 6:
        print "The value enter is either too long or too short."
        return
    
    else:
        hex_val = int(hex_val, 16)
    
    two_hex_digits = 2**8
    
    blue = hex_val % two_hex_digits
    hex_val = (hex_val >> 8)
    
    green = hex_val % two_hex_digits
    hex_val = (hex_val >> 8)
    
    red = hex_val % two_hex_digits
    
    print "Red: %s Green: %s Blue %s" % (red, green, blue)

def convert():
    while True:
        option = raw_input("Choose a number: \n1 for RGB to HEX \n2 for HEX to RGB \n3 to quit\n: ")
        if option == "1":
            print "RGB to HEX"
            rgb_hex()
        elif option == "2":
            print "Hex to RGB"
            hex_rgb()
        elif option == "3":
            break
        else:
            print "ERROR"
convert()