You are right , sym-link is simple example.

In multi-python multi-web2py envs I use to full path to python
(centos 7 /etc/systemd/syste/gunicorn.service)
---------------
[Unit]
Description=Gunicorn instance to serve web2py
After=network.target

[Service]
User=w2p
Group=w2p
WorkingDirectory=/home/w2p/web2py
#Environment="PATH=/home/w2p/.conda/envs/lic/bin/:$PATH"
#ExecStart=/home/w2p/.conda/envs/lic/bin/gunicorn --workers 24 --timeout=90 
--graceful-timeout=10 --bind 127.0.0.1:8005 wsgihandler:application
ExecStart=/home/w2p/.conda/envs/lic/bin/gunicorn --workers 20 --timeout=90 
--graceful-timeout=10 --reload --bind unix:/home/w2p/var/gunicorn.sock 
wsgihandler:application

Restart=always
[Install]
WantedBy=multi-user.target

--------------
/home/w2p/.conda/envs/lic/bin/gunicorn
-------------------------------
#!/home/w2p/.conda/envs/lic/bin/python
if __name__ == '__main__':
    import sys
    from gunicorn.app.wsgiapp import run

    sys.exit(run())
------------------------------------
also, I use to pip with full path or with sym-link  

вторник, 8 мая 2018 г., 3:11:37 UTC+3 пользователь 黄祥 написал:
>
> plan to test web2py both python2 and python3 in 1 machine, any idea how to 
> do that in the safety way?
> already googling found this:
>
> brew update
> brew install python
> brew install python3
>
> any thought or comment?
>
> thx and best regards,
> stifan
>

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