conda.md

Conda

Environments

Conda makes it easy to manage multiple different environments (particular software at particular versions) on your computer. This allows you to easily switch between environments, create new environments, and share environments with others (or your future self).

As an example of where this is useful, I recently had a minor crisis when I went to run some code and it tripped a bunch of errors with no clear fix. I hadn't touched it since I ran it without issue a month ago, but suddenly there were all these errors. Some digging showed that a python library had been upgraded in the meantime, creating the issue. I was able to make a new environment with the old library version, and re-run without issue. Now, I try to save an environment.yml with every project.

Other great resources about environments:

• Conda Cheat Sheet
• Conda Documentation: Managing environments
• My Python Environment Workflow with Conda by Tim Hopper

General

List envs

conda info --envs

OR

conda env list

Activate environment

source activate myenv

Remove environment

conda remove --name myenv --all

History

You can see the history by running:

conda list --revisions

...and update to a previous revision by running:

conda install --revision 1

See more here

txt

Create environment from env.txt

conda env create --file env.txt

or

conda create --name <env> --file <this file>

Save current environment to env.txt

conda list --explicit > env.txt

yml

Create environment from environment.yml

conda env create -f environment.yml

Note: the environment name is defined in the environment.yml so no need to specify

Save current environment to environment.yml

conda env export > environment.yml