It appears that code only declares a single sensor object and the address you are providing it is not the default address. These sensors are located at the default address when they are first powered. You should look through the documentation for the PyPi package to see how to change the address of the sensor. As I mentioned before, after you change the address of one of the sensors, you will need to toggle the XSHUT pin on the other sensor to reset it so that it is available at the default address.
-Nathan