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rgb2hex.py

def rgb_hex():
  invalid_msg = "Invaid input! Please try again."
invalid_msg = "Error! Invalid input."
red = int(raw_input("Enter a value for red (R): "))
if red < 0 or red > 255:
  print invalid_msg
  return

green = int(raw_input("Enter a value for green (G): "))
if green < 0 or green > 255:
  print invalid_msg
  return

blue = int(raw_input("Enter a value for blue (B): "))
if blue < 0 or blue > 255:
  print invalid_msg
  return
  
val = (red << 16) + (green << 8) + blue

print list(hex(val[2: ].upper()))


def hex_rgb():
  hex_val = raw_input("Enter a value (six hexadecimal digits): ")
  if len(hex_val) != 6:
     print "Error! Invalid input.Try again!"
     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("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:
      "Error..."
      
convert()