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Pyenv Notes
Up to now, I haven been using virtualenv for my Python development. Recently, after having run into issues now and then - which were more related to the installation of Python on my MacBook, I started looking for alternatives. Pyenv seems a nice candidate, because it focusses more on separate Python installations.
Good habits die hard, so it will take some time to convert my mind and fingers to use pyenv. These notes will help ;-)
Global Installation
Install pyenv itself…
MacOS
$ brew install pyenv
From Git repo
$ git clone https://github.com/pyenv/pyenv.git ~/.pyenv
$ cd ~/.pyenv && src/configure && make -C src
$ echo 'eval "$(pyenv init --path)"' >> ~/.zprofile
$ echo 'eval "$(pyenv init -)"' >> ~/.zshrc
Minimal Python build enviornment
$ brew install openssl readline sqlite3 xz zlib
Virtuelenv support
Also install virtualenv plugin
$ git clone https://github.com/pyenv/pyenv-virtualenv.git $(pyenv root)/plugins/pyenv-virtualenv
$ echo 'eval "$(pyenv virtualenv-init -)"' >> ~/.zshrc
Install a version of Python…
$ pyenv install --list
$ pyenv install 3.8.12
Enable the version for global use
$ pyenv global 3.8.12
$ pyenv version
3.8.12 (set by /Users/xtof/.pyenv/version)
Managing Virtual Environments
Create a virtual environment based on a Python version…
$ pyenv virtualenv 3.8.12 hello_world
or “fork” from active version:
$ pyenv version
3.8.12 (set by /Users/xtof/.pyenv/version)
$ pyenv virtualenv test3.8.12
Looking in links: /var/folders/nq/xvzwtwsj25727ybthkp1wmhr0000gn/T/tmpji3hjgb_
Requirement already satisfied: setuptools in /Users/xtof/.pyenv/versions/3.8.12/envs/test3.8.12/lib/python3.8/site-packages (56.0.0)
Requirement already satisfied: pip in /Users/xtof/.pyenv/versions/3.8.12/envs/test3.8.12/lib/python3.8/site-packages (21.1.1)
$ pyenv versions
system
* 3.8.12 (set by /Users/xtof/.pyenv/version)
3.8.12/envs/test3.8.12
test3.8.12
Removing a virtual environment
$ pyenv uninstall test3.8.12
Enabling the virtual environment for a given folder…
$ cd hello_world
$ pyenv local hello_world
$ pyenv version
hello_world (set by /Users/xtof/Workspace/hello_world/.python-version)
$ cd ..
$ pyenv version
3.8.12 (set by /Users/xtof/.pyenv/version)
$ cd hello_world
$ pyenv version
hello_world (set by /Users/xtof/Workspace/hello_world/.python-version)
Makefile support for the virtual environment, creating it if needed:
.python-version:
@pyenv virtualenv 3.8.12 $$(basename ${CURDIR}) > /dev/null 2>&1 || true
@pyenv local $$(basename ${CURDIR})
@pyenv version
