Prepare

• Django project ready to deploy
• Many private keys:
  • Database username/password
  • Twilio username/password
  • Django SECRET_KEY
  • ... many others

Solution

Yes, you may to save variable directly in your code. But this is a bad practice. Because not secure save keys in Github or another git solution!

1.Use Environment variables

import os

os.environ['MY_VAR'] = 'Private value' # Set key-value
my_var = os.environ.get('MY_VAR') # Read variable value from anywhere

Cons: after restart server we loose Environment variables

2.Save Environment variables in .bashrc (.zshrc)

Add to your ~/.zshrc file:

...

export MY_VAR="Private value" # Here!

# source ~/.zshrc

Good. Now we can to read our variable:

import os

my_var = os.environ.get('MY_VAR') # return 'Private value'

Bonus

• For Django use useful environ-wrapper: django-environ
• Create .env file, past private data to it and this is all:

env = environ.Env()
environ.Env.read_env()

SECRET_KEY = env('SECRET_KEY')

# Database
# https://docs.djangoproject.com/en/2.1/ref/settings/#databases
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': env('DB_NAME'),
        'USER': env('DB_USER'),
        'PASSWORD': env('DB_PASSWORD'),
        'HOST': 'localhost',
        'PORT': '',
    }
}

• Don't forget to add .env to your .gitignore