Quick personal notes on setting up virtual env and multiple Python versions on Mac

brew install virtualenvwrapper

Make a new v-env

mkvirtualenv my-project

Use the new v-env

workon my-project

deactivate

deactivate my-project

list

lsvirtualenv -b

remove

rmvirtualenv my-project

brew install pyenv

install a version of Python

pyenv install 3.7.9

NOTE: various compatibility issues on Mac M1 chips with Python earlier than 3.8: https://bugs.python.org/msg382939

list versions

pyenv versions

current version

pyenv version

Set the version of python to work with in a particular folder:

pyenv local 3.7.9

(sets the python version when working in the folder where this version was initialised)

Activate the version of Python you want to use (i.e. pyenv local 3.7.9).

Create a virtual env that uses that version.

mkvirtualenv --python=`pyenv which python` myproject

Activate it with workon

eval "$(/opt/homebrew/bin/brew shellenv)"

# Configuration for virtualenv
export WORKON_HOME=$HOME/.virtualenvs
export VIRTUALENVWRAPPER_PYTHON=/opt/homebrew/bin/python3
export VIRTUALENVWRAPPER_VIRTUALENV=/opt/homebrew/bin/virtualenv
source /opt/homebrew/bin/virtualenvwrapper.sh

export PYENV_ROOT="$HOME/.pyenv"
command -v pyenv >/dev/null || export PATH="$PYENV_ROOT/bin:$PATH"
eval "$(pyenv init -)"

# Fix path issue in Pycharm for virtualenvwrapper.sh 
export PATH=$PATH:/opt/homebrew/bin
# use the same directory for virtualenvs as virtualenvwrapper
export PIP_VIRTUALENV_BASE=$WORKON_HOME

# makes pip detect an active virtualenv and install to it
export PIP_RESPECT_VIRTUALENV=true
                

This was painful, but it can be done.

Useful Stack Overflow forum: https://stackoverflow.com/questions/34520291/pycharm-cannot-find-the-packages-in-virtualenv

Step 1 Select Setup for the Python Interpreter for this Project

Step 2 Add an new Interpreter for this Project

Step 3 Select the Python executable in the correct Virtualenv path

NOTE Sometime the V-env doesn't show up in the list - you have to navigate using the elipsis (...) by the Interpreter dialog box and find the path to the linked Python interpreter for the virtual env required.

In this example, the virtualenv being selected is called mlflow.

brew install --cask adoptopenjdk/openjdk/adoptopenjdk8

Check:

java -version

openjdk version "1.8.0_292"
OpenJDK Runtime Environment (AdoptOpenJDK)(build 1.8.0_292-b10)
OpenJDK 64-Bit Server VM (AdoptOpenJDK)(build 25.292-b10, mixed mode)

Default Location

which java
/usr/bin/java

1. Get a PAT from GitHub (Profile -> Settings -> Developer Settings (bottom l-h side of screen) -> Personal access tokens
2. In the env to set up authentication, set git to cache credentials: git config --global --replace-all credential.helper cache
3. git pull - supply the PAT in place of the password.