Clash Royale CLAN TAG#URR8PPP

Can I add a channel to a specific conda environment?

I want to add a conda channel to a specific conda environment but when I use

conda config --add channels glotzer


that channel is now available from all my conda environments. In addition to testing an install from another environment, the ~/.condarc file has the following:

~/.condarc

channels:
- glotzer
- defaults


How would I configure conda so the channel is only available from a specific environment?

I did find in the channel documentation that for conda >= 4.1.0, putting channels at the bottom of the ~/.condarc will prevent added channels from overiding the core package set.

~/.condarc

By default conda now prefers packages from a higher priority channel over any version from a lower priority channel. Therefore you can now safely put channels at the bottom of your
channel list to provide additional packages that are not in the
default channels, and still be confident that these channels will not
override the core package set.

I expect this will prevent most problems, except when in one environment you do want the package added through a channel to override a core package.

conda update -c conda-forge --all

conda-forge

3 Answers
3

Currently it is not possible to add a channel to a single conda environment. If you do not want to add a channel to the global ~/.condarc file, you should use the option to install a package from a specific channel:

~/.condarc

conda install <some-package> -c glotzer


As of conda 4.2, environment-specific .condarc files are supported and you can write:

.condarc

conda config --env --add channels glotzer


to add the channel to the configuration for the active environment.

[Not sure whether --env flag was added in 4.2. Answer based on conda 4.5.9]

--env

conda config -h

You can create an environment.yml file containing the specification of your conda environment. The full docs are here, but the basic setup is as follows:

environment.yml

conda

name: EnvironmentName
channels:
- conda-forge
- glotzer
dependencies:
- pip:
- tensorflow
- pandas=0.22.*


To use the environment, type

conda env create -f environment.yml
conda activate EnvironmentName


To update the environment when environment.yml is changed or packages are updated,

environment.yml

conda env update -f environment.yml
conda activate EnvironmentName


environment.yml

.condarc

environment.yml

conda install

conda --env update

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