code: def all_values(*values):
      
      print("here")
      values = [_normalize(v) for v in values]
      for v in zip(*values):
          yield all(v)
docs: Returns the `logical conjunction`_ of all supplied values (the result is
      only :data:`True` if and only if all input values are simultaneously
      :data:`True`). One or more *values* can be specified. For example, to light
      an :class:`~gpiozero.LED` only when *both* buttons are pressed::
  
          from gpiozero import LED, Button
          from gpiozero.tools import all_values
          from signal import pause
  
          led = LED(4)
          btn1 = Button(20)
          btn2 = Button(21)
  
          led.source = all_values(btn1, btn2)
  
          pause()
  
      .. _logical conjunction: https://en.wikipedia.org/wiki/Logical_conjunction