help!,pbs_python can not install in galaxy_20.05

galaxy 20.05 use python3.x but psb_python use python2.x
I get a lots of error,

I use this step:
Connecting to a Cluster — Galaxy Project 20.05 documentation

galaxy_user@galaxy_server% git clone https://github.com/ehiggs/pbs-python galaxy_user@galaxy_server% cd pbs-python galaxy_user@galaxy_server% source /clusterfs/galaxy/galaxy-app/.venv/bin/activate galaxy_user@galaxy_server% python setup.py install