conda

TLDR

Create a new environment, installing named packages into it

$ conda create --name [environment_name] [python=3.9 matplotlib]

List all environments

$ conda info --envs

Load an environment

$ conda activate [environment_name]

Unload an environment

$ conda deactivate

Delete an environment (remove all packages)

$ conda remove --name [environment_name] --all

Install packages into the current environment

$ conda install [python=3.4 numpy]

List currently installed packages in current environment

$ conda list

Delete unused packages and caches

$ conda clean --all