The function reference file is located in
The Dynamixel SDK example code for Python uses the library files(.so for Linux) built in C language.
Each released Dynamixel SDK have latest library files in
[DynamixelSDK folder]/c/build/[linuxXX]/dxl_xYY_c.so which were built by its own source code.
Modify library file path, considering your platform.
Adjust the values surrounded with red circle to proper value as shown in the comment.
Make the port be able to be used
$ sudo chmod a+rw /dev/ttyUSB0
Go to the folder
[DynamixelSDK folder]/python/protocol1_0/, using
cd, then run example code by typing