run o-help for a list of available commands
C:\Windows\System32>cd..

C:\Windows>cd..

C:\>py3_env

C:\>SET PYTHONPATH=

C:\>SET PYTHONHOME=C:\PROGRA~1\QGIS3~1.8\apps\Python37

C:\>PATH C:\PROGRA~1\QGIS3~1.8\apps\Python37;C:\PROGRA~1\QGIS3~1.8\apps\Python37\Scripts;{app};C:\PROGRA~1\QGIS3~1.8\apps\Python27\Scripts;C:\PROGRA~1\QGIS3~1.8\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\system32\WBem;C:\Program Files\R\R-3.5.2\bin\x64

C:\>pip3 install netcdf4
Requirement already satisfied: netcdf4 in c:\progra~1\qgis3~1.8\apps\python37\lib\site-packages (1.5.2)
Requirement already satisfied: cftime in c:\progra~1\qgis3~1.8\apps\python37\lib\site-packages (from netcdf4) (1.0.3.4)
Requirement already satisfied: numpy>=1.7 in c:\progra~1\qgis3~1.8\apps\python37\lib\site-packages (from netcdf4) (1.16.3)

C:\>