How to change default Anaconda python environment

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If you just want to temporarily change to another environment, use

source activate environment-name

ETA: This may be deprecated. I believe the current correct command is:

source conda activate environment-name

(you can create environment-name with conda create)

To change permanently, there is no method except creating a startup script that runs the above code.

Typically it’s best to just create new environments. However, if you really want to change the Python version in the default environment, you can do so as follows:

First, make sure you have the latest version of conda by running

conda update conda

Then run

conda install python=3.5

This will attempt to update all your packages in your root environment to Python 3 versions. If it is not possible (e.g., because some package is not built for Python 3.5), it will give you an error message indicating which package(s) caused the issue.

If you installed packages with pip, you’ll have to reinstall them.

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