tutorial
[admin@vertigo] ~% source envs/monflaskr/bin/activate.csh [monflaskr] [admin@vertigo] ~%
[dc@bolido] ~% virtualenv -p /usr/local/bin/python3 venv3 [dc@bolido] ~% source venv3/bin/activate.csh [venv3] [dc@bolido] ~% pip install pandas