Install Python environment on local PC (pyenv, venv on Mac)

Introduction

Here's how to install pyenv as a Python environment on your Mac. Here, I will show you how to git clone from pyenv's github (https://github.com/pyenv/pyenv) and pass it through Path. We will also show you how to create a virtual environment with venv depending on the tool and system you want to run.

Premise

--You can use git command --The shell uses zsh.

Why pyenv instead of the official version?

According to the story of Japanese Python users, it is recommended to download and install from the official Python site (https://www.python.org). I will.

However, when actually using Python,

--I want to use the latest version of Python 3.7 at the time of development for what I developed before ――I want to use the latest version of Python 3.9

So, you will want to switch versions depending on what you move. Therefore, I would like to take the method of building the environment with pyenv and installing the required version.

reference

--pyenv official website https://github.com/pyenv/pyenv

pyenv download

git clone https://github.com/pyenv/pyenv.git ~/.pyenv

To get pyenv.

Pass through

On the official website Because it is described as

echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.zshrc
echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.zshrc

And pass the Path.

continue, Because there is

echo -e 'if command -v pyenv 1>/dev/null 2>&1; then\n  eval "$(pyenv init -)"\nfi' >> ~/.zshrc

To execute.

Reboot the terminal or

source ~/.zshrc

Apply with.

Verification

pyenv versions

To list the environments installed by pyenv. I just installed pyenv, so

* system (set by /Users/*****/.pyenv/version)

I think that only one line is displayed.

• The "*****" part shows the name of the user who is actually running the terminal.

Python version installation

To check the installable version

pyenv install --list

To execute.

pyenv install --list | grep -E "^ +\d.+\d+$"

Then you can narrow down only the versions that start with a number and end with a number.

  3.7.8
  3.7.9
  3.8.0
  3.8.1
  3.8.2
  3.8.3
  3.8.4
  3.8.5
  3.8.6
  3.9.0

Is displayed, so here, install the latest version of 3.9.0.

pyenv install 3.9.0

After a while, the installation is complete and

Installed Python-3.9.0 to /Users/*****/.pyenv/versions/3.9.0

Is displayed. continue,

pyenv shell 3.9.0

Enable the version you just installed in

python -V

Check the Python version with.

Python 3.9.0

If the Python version is displayed like, it is successful.

Create virtual environment with venv

python -m venv *****

Create a virtual environment with. The ***** part specifies the path of the directory where the virtual environment is created. For example, if you want to create an environment for studying 3.9.0

pyenv shell 3.9.0
python -m venv ~/.venv/3.9.0/study

You can also do something like

• Since you will be creating multiple virtual environments, I think it would be better to create a directory hierarchy that is easy to understand later.

Next, if you want to enable the created virtual environment,

source ~/.venv/3.9.0/study/bin/activate

To do. Then the prompt

(study) *****@******** ~ %

It looks like.