does Python XBee support have libraries for utiziling the MCP23017 I2C I/O port expander. I’m assuming one would use Micropython I2C to setup the I/O port expander onto the I2C bus and then have I2C sensors plugged into the I/I expander. thanks 
Unfortunately there are no dedicated libraries available for MCP23017 hall effect sensor.
All information related to I2C interfacing on these modules that’s available in public domain can be found at below provided link:
https://www.digi.com/resources/documentation/Digidocs/90002219/#reference/r_class_i2c.htm
Mathur
Digi Technical Support