Sets the gpio level.

        gpio:= 0-53.
        level:= 0, 1.

        If PWM or servo pulses are active on the gpio they are
        switched off.

        ...
        pi.set_mode(17, pigpio.OUTPUT)

        pi.write(17,0)
        print(pi.read(17))
        0

        pi.write(17,1)
        print(pi.read(17))
        1
        ...

def write(self, gpio, level):
        """
        Sets the gpio level.

        gpio:= 0-53.
        level:= 0, 1.

        If PWM or servo pulses are active on the gpio they are
        switched off.

        ...
        pi.set_mode(17, pigpio.OUTPUT)

        pi.write(17,0)
        print(pi.read(17))
        0

        pi.write(17,1)
        print(pi.read(17))
        1
        ...
        """
        res = yield from self._pigpio_aio_command(_PI_CMD_WRITE, gpio, level)
        return _u2i(res)