import error: No module named yarp

[jimingda]

Sorry to ask for help, i read the same question before
#1365

And i set the PYTHONPATH, but still failed to import yarp

echo $PYTHONPATH
/usr/local/src/robot/robotology-superbuild/build/install/bin

icub@icubsrv:python3
Python 3.8.10 (default, Mar 13 2023, 10:26:41)
[GCC 9.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import yarp
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'yarp'