def __init__(self, pin_number, shift_register_74hc595):
        """Specify the pin number of the shift register (0...7) and
        ShiftRegister74HC595 instance.
        """
        self._pin = pin_number
        self._shift_register = shift_register_74hc595
def __init__ ( self , pin_number , shift_register_74hc595 ) : self . _pin = pin_number self . _shift_register = shift_register_74hc595
Specify the pin number of the shift register (0...7) and
        ShiftRegister74HC595 instance.