How can I manage the modules for python2 when python3 installed as well. In OSX

ref: https://stackoverflow.com/questions/53385448/how-can-i-manage-the-modules-for-python2-when-python3-installed-as-well-in-osx

I'm using OSX and I installed python3 with anaconda installed. In my OSX, there exists two versions of python, i.e. python2 and python3.

I managed the modules in anaconda which only affect modules in python3. But how can I manage(install, delete, update) the modules for python2?

I've checked some posts about 'python2 is at /usr/bin/python' . So it's ok to use python2 by '/usr/bin/python' without configuring alias. But, how can I manage(install, delete, update) the modules for python2 when python3 installed as well. In OSX.

Anaconda comes with a package and environment manager called conda. This is what you need to do:

Create a separate Python 2.7 environment, let's call it old and busted.

conda create --name old_and_busted python=2.7

Now switch to this environment:

conda activate old_and_busted

Verify it worked if you want:

python --version

Install some modules cool:

conda install flask

Bonus, use pip to install something cool in the same environment:

pip install flask

What environment are we in again?

conda env list

Let's check for that package:

conda list

Now this part is very important, make sure to do it often - go back to your Python 3 environment:

conda activate base

pipenv manages environments in a similar way. Anaconda specializes in packaging for scientific computing handling packaging non-python extensions (e. g. C, C++) dependencies well.

** Note on conda vs source for environment activation **

If conda activate does not work use source activate. This was changed in Anaconda 4.4.0.
If you have this in your .bash_profile (or .profile or other magical dotfile) you use source activate:

export PATH="$HOME/anaconda3/bin:$PATH"

If you have this updated code in your shell startup then you can use conda activate:

. $HOME/anaconda3/etc/profile.d/conda.sh
conda activate