Might be something...

def software_reset(i2c=None, **kwargs):
    """Sends a software reset (SWRST) command to all servo drivers on the bus."""
    # Setup I2C interface for device 0x00 to talk to all of them.
    if i2c is None:
        from smbus2 import SMBus
        i2c = SMBus
    self._device = i2c.open(0x00, bus="/dev/i2c-2", **kwargs)
    self._device.write_byte(0x06)  # SWRST