rgb_hex.py

def rgb_hex():
  invalid_msg = "You have entered an incorrect value"
  red = int(raw_input("Enter a value for red: "))
  if red < 0 or red > 255:
    print invalid_msg
    return
  green = int(raw_input("Enter a value for green: "))
  if green < 0 or green > 255:
    print invalid_msg
    return
  blue = int(raw_input("Enter a value for blue: "))
  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():
  invalid_msg = "You have entered an incorrect value"
  hex_val = raw_input("Kindly enter a hex value: ")
  if len(hex_val) != 6:
    print invalid_msg
    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():
  run = True
  while run == True:
    option = raw_input("Enter 1 to convert RGB to HEX. Enter 2 to convert HEX to RGB. Enter X to Exit: ")
    if option == "1":
      print "RGB to Hex..."
      rgb_hex()
    elif option == "2":
      print "HEX to RGB..."
      hex_rgb()
    elif option == "X" or option == "x":
      break
    else:
      print "Error"
convert()