Preparing Python Environment

The basic steps are:

1. Create a requirements file.

2. Install a new virtual environment (pycx).

   • Load the virtual environment.

   • Install libraries.

   • Unload the virtual environment.

3. Reload

Make requirements.txt

Below is a bash command that makes a requirements.txt

cat << EOF > requirements.txt
netCDF4>=1.5.8,!=1.7.0,!=1.7.1
pseudonetcdf>=3.5
numpy>=1.19.5,<2
scipy>=1.5.4
pandas>=1.1.5
xarray>=0.16.2
pyproj>=2.6.1
pycno
pyrsig>=0.12.0
cmaqsatproc>=0.5.2
EOF

Install a new virtual environment

• Make a new virtual environment (pycx)

• Load the virtual environment.

• Install libraries.

• Unload virtual environment (optional)

python3 -m venv pycx
source pycx/bin/activate
python -m pip install -r requirements.txt
deactivate

Reload Environemnt

Any time you want to use the python environment, load it.

source pycx/bin/activate

The environment will stay active until you either run deactivate or logout.