docs: def rgb_to_hex(cls, color):
          """
          Convert an ``(r, g, b)`` color tuple to a hexadecimal string.
  
          Alphabetical characters in the output will be capitalized.
  
          Args:
              color (tuple): An rgb color tuple of form: (int, int, int)
  
          Returns: string
  
          Example:
              >>> SoftColor.rgb_to_hex((0, 0, 0))
              '#000000'
              >>> SoftColor.rgb_to_hex((255, 255, 255))
              '#FFFFFF'
          """
          return '#{0:02x}{1:02x}{2:02x}'.format(
              cls._bound_color_value(color[0]),
              cls._bound_color_value(color[1]),
              cls._bound_color_value(color[2])).upper()