[Virtualenv setup] Setup python virtualenv on macos #macos #python #virtualenv #setup

venv.sh

## Simple python virtual environment management
python3 -m venv segement_demo
source segement_demo/bin/activate
pip3 install requests
##### ------------ end --------- #####

# Install virtualenv & virtualenv wrapper
pip3 install virtualenv
pip3 install virtualenvwrapper

## put this in the .zshrc file
## Virtualenv
export VIRTUALENVWRAPPER_PYTHON=/usr/local/bin/python3
export VIRTUALENVWRAPPER_VIRTUALENV=/usr/local/bin/virtualenv
#export VIRTUALENVWRAPPER_VIRTUALENV_ARGS='--no-site-packages'
source /usr/local/bin/virtualenvwrapper.sh

## Virtualenvwrapper command reference 
https://virtualenvwrapper.readthedocs.io/en/latest/command_ref.html

# create virtualenv
mkvirtualenv <abc>
mkvirtualenv -v --python=python2.7 p27

# list all virtualenv
lsvirtualenv

# show all virtual env's
showvirtualenv

# activate virtual env
workon
echo $VIRTUAL_ENV

# list packages in the current virtual env
lssitepackages

# remove all site packages
wipeenv


############## Manage multiple versions of python ####################
## Reference : https://www.freecodecamp.org/news/manage-multiple-python-versions-and-virtual-environments-venv-pyenv-pyvenv-a29fb00c296f/

############## Install pyenv ####################

## Install pyenv to manage multiple versions of python
brew install pyenv


## Install pyenv on centos
curl https://pyenv.run | bash

## Add this to the .bashrc
export PATH="/home/centos/.pyenv/bin:$PATH"
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"


## Install development pre-reqs
sudo yum install @development zlib-devel bzip2 bzip2-devel readline-devel sqlite sqlite-devel openssl-devel xz xz-devel libffi-devel findutils


############## pyenv commands ####################


## Activate pyenv
eval "$(pyenv init -)"

## Install requisite python version
pyenv install 3.8.1

## Set the active python version
pyenv local 3.8.1

## install pyenv virtualenv 
brew install pyenv-virtualenv

## Activate pyenv - virtualenv
eval "$(pyenv virtualenv-init -)"

## Create a new pyenv - virtualenv
pyenv virtualenv 3.8.1 p381

## activate specific environment
pyenv activate p381