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()

def inverted(values, input_min=0, input_max=1):
    """
    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()
    """
    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