old_contents: import sublime
  import sublime_plugin
  import urllib
  
  
  class Css3HexConvertCommand(sublime_plugin.TextCommand):
      def run(self, edit):
          window = self.view.window()
          window.show_input_panel("RGB:", "", self.validate_and_convert, None, None)
  
      def validate_and_convert(self, input_string):
          input_string = "".join(input_string.split())  # remove all whitespace
          if input_string == "":
              print("the user entered nothing")
              return
  
          colors = input_string.split(",")
          if len(colors) != 3:
              sublime.error_message("ERROR: You entered {} colors. Three colors are required (red, "
                                    "green, blue).\n\nHere's an example of a correct RGB value:\n\t"
                                    "255, 255, 255".format(len(colors)))
              return
  
          color_values = []
          try:
              for color in colors:
                  color_value = int(color)
                  if not (0 <= color_value <= 255):
                      raise ValueError(color)
                  color_values.append(color_value)
          except ValueError as rgb_err:
              sublime.error_message("ERROR: {} is outside the range 0-255".format(rgb_err))
              return
  
          hex_string = self.convert(color_values)
  
          self.view.run_command("css3_hex_insert", {"hex": hex_string})
  
      def convert(self, rgb):
          if all(c % 17 == 0 for c in rgb):
              # return the three character hex notation, ex: #abc instead of #aabbcc
              return "#" + "".join("{:x}".format(c)[0] for c in rgb)
          return "#" + "".join("{:02x}".format(c) for c in rgb)
  
  
  class Css3HexInsertCommand(sublime_plugin.TextCommand):
      def run(self, edit, **args):
          for region in self.view.sel():
              self.view.replace(edit, region, "")
              insert_point = region.begin()
              self.view.insert(edit, insert_point, args["hex"])
  
  
new_contents: import sublime
  import sublime_plugin
  import urllib
  
  
  class Css3HexConvertCommand(sublime_plugin.TextCommand):
      """Convert RGB color values to hex colors"""
  
      def run(self, edit):
          """Prompt the user for a comma-separated list of three numbers."""
          window = self.view.window()
          window.show_input_panel("RGB:", "", self.validate_and_convert, None, None)
  
      def validate_and_convert(self, input_string):
          """Perform the conversion of RGB colors values to hex."""
          input_string = "".join(input_string.split())  # remove all whitespace
          if input_string == "":
              print("the user entered nothing")
              return
  
          colors = input_string.split(",")
          if len(colors) != 3:
              sublime.error_message("ERROR: You entered {} colors. Three colors are required (red, "
                                    "green, blue).\n\nHere's an example of a correct RGB value:\n\t"
                                    "255, 255, 255".format(len(colors)))
              return
  
          color_values = []
          try:
              for color in colors:
                  color_value = int(color)
                  if not (0 <= color_value <= 255):
                      raise ValueError(color)
                  color_values.append(color_value)
          except ValueError as rgb_err:
              sublime.error_message("ERROR: {} is outside the range 0-255".format(rgb_err))
              return
  
          hex_string = self.convert(color_values)
  
          self.view.run_command("css3_hex_insert", {"hex": hex_string})
  
      def convert(self, rgb):
          """Return a three-letter hex code if possible."""
          if all(c % 17 == 0 for c in rgb):
              # return the three character hex notation, ex: #abc instead of #aabbcc
              return "#" + "".join("{:x}".format(c)[0] for c in rgb)
          return "#" + "".join("{:02x}".format(c) for c in rgb)
  
  
  class Css3HexInsertCommand(sublime_plugin.TextCommand):
      """Insert the hex colors from the converter into the text."""
  
      def run(self, edit, **args):
          for region in self.view.sel():
              self.view.replace(edit, region, "")
              insert_point = region.begin()
              self.view.insert(edit, insert_point, args["hex"])
  
subject: add docstrings to rgb converter script