Notes from installing Homebrew to building an Anaconda environment for Python with pyenv

** Homebrew **: "One of the package management systems that simplifies software deployment on the Mac OS X operating system" by wikipedia PS: Homebrew officially supports running on Linux and Windows (WSL) environments in addition to macOS.

** pyenv **: A tool for managing different versions of Python. By introducing it, it becomes easy to switch between multiple versions such as Python v2 series and v3 series.

** Anaconda **: A package that includes a set of libraries that can be used for scientific calculations and data analysis in addition to Python itself.

Anaconda is a free collection of powerful packages for Python that enables large-scale data management, analysis, and visualization for Business Intelligence, Scientific Analysis, Engineering, Machine Learning, and more.

environment

Mac OSX 10.11.3 (my environment) Confirmed on Mac OSX 10.14

• Since macOS 10.15 Catalina, the default shell has been changed from bash to zsh, so if you are newly installing with Catalina, please write the part of 4.pyenv installation to .zshrc.

• Added on May 24, 2020 I also confirmed the operation in my Windows 10 WSL2 (Ubuntu) environment.

Note

Enter the command as it is on the terminal. Each command after "\ $" is one command. You do not need to enter the "\ $" mark.

1. Check if Homebrew is installed

Terminal

$ brew --version  

Those who say Homebrew 1.7.6 etc. are already installed, so go to 3.

2. Install Homebrew

Those who do not have Homebrew installed

Terminal

$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

3. Homebrew environment update

Terminal

$ brew update --force && brew upgrade

4. Install pyenv

・ If you are using bash

Terminal

$ brew install pyenv
$ echo 'eval "$(pyenv init -)"' >> ~/.bash_profile

$ exec $SHELL -l

• If you are using zsh, replace ~ / .bash_profile with ~ / .zshrc. $ echo 'eval "$(pyenv init -)"' >> ~/.zshrc Please.

5. Install Python (Anaconda)

• You can display a list of installable versions with $ pyenv install -l. Check there for the latest version of anaconda.

Those who want to use Python version 3 series

Terminal

$ pyenv install anaconda3-2019.10
$ pyenv global anaconda3-2019.10

Those who want to use Python version 2 series

Terminal

$ pyenv install anaconda-4.0.0
$ pyenv global anaconda-4.0.0

pyenv global ensures that all directories run the corresponding Python version. If you want to use the corresponding version only in a specific directory, use pyenv local anaconda3-2019.10.

6. Confirmation

Terminal

$ python
Python 3.7.4 (default, Aug 13 2019, 15:17:50)
[Clang 4.0.1 (tags/RELEASE_401/final)] :: Anaconda, Inc. on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>

If you type python and the above appears, the installation is successful. (For v.3 series) Exit Python's interactive shell by pressing Ctrl + D (or typingquit ()).

7. Switching Python version (How to use pyenv)

Terminal

$ pyenv versions

You can check the version of python installed by pyenv with.

Terminal

$ pyenv global anaconda3-4.0.0

You can specify to use python 3 (anaconda3-4.0.0 in this case) like this. You can switch to another version in the same way.

Also, installing a new Anaconda or Python version

Terminal

$ pyenv install -l

Display a list of python versions that can be installed with

Terminal

$pyenv install feh

You can install the version specified in.

• Originally, Anaconda also has a version control function, so it is not always necessary to install multiple Anaconda. I have multiple Anacondas because I only use pyenv for python version control. Also, if you install Anaconda directly, it will conflict with homebrew, so it is installed via pyenv.

If you have any questions or mistakes, please comment.

Linux version: Memo for building Python Anaconda environment with pyenv in Linux environment