How can I install Anaconda aside an existing pyenv installation on OSX?

Not super familiar with conda but I do use pyenv a lot.

Pyenv has its own virtualenv manager that you can use. You can always check which virtualenv version is active with:

pyenv versions

You should see something like:

  system
  20190814_125309
* 3.7.4 (set by /home/tzhuang/.pyenv/version)
  3.7.4/envs/20190814_125309
  3.7.4/envs/buildmaster-sandbox
  3.7.4/envs/HEAD
  3.7.4/envs/myenv
  3.7.4/envs/sandbox
  buildmaster-sandbox
  HEAD
  myenv
  sandbox

Where the * indicates the currently active virtualenv (this can be set using pyenv global like you mentioned). You can manually activate any virtualenv with:

pyenv shell

Eg.

pyenv shell sandbox

Then running pyenv versions gives:

  system
  20190814_125309
  3.7.4 (set by /home/tzhuang/.pyenv/version)
  3.7.4/envs/20190814_125309
  3.7.4/envs/buildmaster-sandbox
  3.7.4/envs/HEAD
  3.7.4/envs/myenv
  3.7.4/envs/sandbox
  buildmaster-sandbox
  HEAD
  myenv
* sandbox

It's generally a good idea to install any packages you want into a new virtualenv instead of the global virtualenv. It makes it easier to debug environment/dependency issues should you run into any.

There is a conflict, cause both pyenv and conda try to expose a global Python environment by default.

I've been using these tools together and best solution found by me is to

1. Alway initialize pyenv, use the Python set by pyenv global as the default Python
2. Only expose command conda but do NOT activate any environment from it

Detail

Since pyenv has been installed on your machine, you only need to install Anaconda.

brew cask install anaconda

Init conda without exposing the "base" environment from conda.

# init conda, the following command write scripts into your shell init file automatically
conda init

# disable init of env "base"
conda config --set auto_activate_base false

Done.

Note: After this setup, the default Python is the one set by pyenv global. Use pyenv and conda to manage environments separately.

Examples of managing virtual environments.

# virtual environments from pyenv
pyenv install 3.6.9
pyenv virtualenv 3.6.9 new-env
pyenv activate new-env
pyenv deactive
# You can also use `pyenv local`


# virtual environments from conda
conda create -n new-env python=3.6
conda env list
conda activate new-env
conda deactivate

Default env location for pyenv is ~/.pyenv/versions.

Default env location for conda, check output from conda info.

Extended Readign

• Getting started with conda
• Using Pip in a Conda Environment, very important
• How do I prevent Conda from activating the base environment by default?