Python Related

1_python_related.md

About general things in Python: from setup to usage

2_mac_os_setup_with_virtual_env.md

Install Python 3

Install python 3 with homebrew. This will also setip pip for us.

brew install python

Add new installed python to the top of your Path

export PATH="/usr/local/opt/python/libexec/bin:$PATH"

Install vritualenv

Install with pip .

pip install virtualenv

pip install virtualenvwrapper

Add following to your .bashrc or .zprofile .

export PATH="/usr/local/opt/python/libexec/bin:$PATH"

export WORKON_HOME=$HOME/.virtualenvs

export VIRTUALENVWRAPPER_PYTHON=/usr/local/opt/python/libexec/bin/python
export VIRTUALENVWRAPPER_VIRTUALENV=/usr/local/bin/virtualenv

source /usr/local/bin/virtualenvwrapper.sh

Using virtualenv

# Create a virutal env in $WORKON_HOME
mkvirtualenv my_env

# Exit out of the current Python virtual environment
deactivate

# List available virtual environments
workon 

# Activate the specified Python virtual environment
workon name_of_environment

# Remove the specified environment
rmvirtualenv name_of_environment

3_pipenv.md

pipenv is slow... really slow...

Pipenv

pipenv can be thought of as the missing project package manager for python.

Its an improved and feature rich alternative to the older pip + requirements.txt combination.

It creates Pipfile and Pipfile.lock files which keep track of dependencies required for the project.

Install

pip install pipenv

Usage

# to install and add a dependency
pipenv install django

# to install and add a dependency with specific version
pipenv install django==3.0.8

# to install and add a dev-dependency
pipenv install pytest --dev

# to generate/update lockfile
pipenv lock

# install project dependencies
pipenv install

# install project dev-dependencies
pipenv install --dev

# install locked project dependencies
pipenv install --ignore-pipfile

# check the dependency graph
pipenv graph