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Install Anaconda

Note: It’s not good practice to share anaconda environments with other users. Make sure to make a backup of your startup file and that you launch a new terminal after the installation.  Example below is for bash.

cp -p ~/.profile ~/.profile.orig

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conda --version

To update, make sure you are in your home directory

cd ~; conda update -n base -c defaults conda

Getting multiple versions of python

List the versions of python you available.

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or

conda env list

Switching between environments

To switch between environments, run the following

#Assuming py27 is the environment name, run:
conda activate /Users/john/anaconda3/envs/py27

#To switch back to the original environment, run:
conda deactivate

Activating and Deactivating Anaconda 

Instead of uninstalling anaconda, you can activate and deactivate Anaconda when needed.

Permanently

The following command will stop Anaconda from launching the base environment upon launching terminal and when opening new terminal windows.  

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Reference: https://stackoverflow.com/questions/54429210/how-do-i-prevent-conda-from-activating-the-base-environment-by-default/54489016#54489016

Temporarily

The following commands will temporarily activate and deactivate Anaconda in a single terminal window. Opening a new terminal window will open in anaconda's base environment.
NOTE: The commands below only works on Conda 4.6 and newer. 

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source deactivate

Deleting environments

https://iq.opengenus.org/delete-conda-environment/

Exporting and Importing Environments

Exporting environments 

conda env export > environment.yml

Importing environments

conda env create -f environment.yml

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reference https://docs.anaconda.com/anaconda/user-guide/tasks/switch-environment/

To uninstall Anaconda

https://docs.anaconda.com/anaconda/install/uninstall/