如何在conda根环境中恢复到python 2？

Question

I created a new python3 environment to install python 3; due to the incompatibility between conda and Windows PowerShell , I installed python 3 in both of the root and python3 environment by accident. Is it possible to revert to python 2 in the root environment?

C:\Users\Nick>conda info --env
# conda environments:
#
python3                  C:\application\anaconda\envs\python3
root                  *  C:\application\anaconda


C:\Users\Nick>python -V
Python 3.3.5 :: Continuum Analytics, Inc.

Answer 1

conda install python=2 should do the trick. Definitely check and make sure that all packages downgraded successfully by inspecting the output of conda list for versions that contain the py3 string. For any packages that contain py3 in the version string, you should probably just uninstall/reinstall them.

(Hypothetical) Example:

The third column in conda list is the python version. If you see:

anaconda-client 1.1.2 py35_0 defaults

then you should

conda remove anaconda-client

followed by

conda install anaconda-client so that it installs the python 2 version.

Then conda list should show the anaconda-client line like this:

anaconda-client 1.1.2 py27_0 defaults .