code: def inverted(values, input_min=0, input_max=1):
      
      values = _normalize(values)
      if input_min >= input_max:
          raise ValueError('input_min must be smaller than input_max')
      for v in values:
          yield input_min + input_max - v
docs: Returns the inversion of the supplied values (*input_min* becomes
      *input_max*, *input_max* becomes *input_min*, `input_min + 0.1` becomes
      `input_max - 0.1`, etc.). All items in *values* are assumed to be between
      *input_min* and *input_max* (which default to 0 and 1 respectively), and
      the output will be in the same range. For example::
  
          from gpiozero import MCP3008, PWMLED
          from gpiozero.tools import inverted
          from signal import pause
  
          led = PWMLED(4)
          pot = MCP3008(channel=0)
  
          led.source = inverted(pot)
  
          pause()