556
Try using conda env update:
conda activate myenv
conda env update --file local.yml --prune
--prune uninstalls dependencies which were removed from local.yml, as pointed out in this answer by @Blink.
Attention: if there is a name tag with a name other than that of your environment in local.yml, the command above will create a new environment with that name. To avoid this, use (thanks @NumesSanguis):
conda env update --name myenv --file local.yml --prune
See Updating an environment in Conda User Guide.
80
The suggested answer is partially correct. You’ll need to add the –prune option to also uninstall packages that were removed from the environment.yml.
Correct command:
conda env update -f local.yml --prune
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alkamid’s answer is on the right lines, but I have found that Conda fails to install new dependencies if the environment is already active. Deactivating the environment first resolves this:
source deactivate;
conda env update -f whatever.yml;
source activate my_environment_name; # Must be AFTER the conda env update line!
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Recently Conda introduced the option to stack environments, which should solve this problem.
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