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Also, in the Javascript world, npm and yarn are both generally understood to be the main package management tools ( with package.json and yarn.lock) and optionally nvm (or similar) can be used to select a Node runtime.
# In our server’s shell, set the `DATABASE_URL` variable. # `export` allows programs outside of this current shell session to use `DATABASE_URL`. root@28b24b724f54:/# export DATABASE_URL="postgresql://mydbuser:mysecretpass@thePGserver/db" # Let’s also set our environment type root@28b24b724f54:/# export ENV=development # Let’s see what Python would give us with `os.environ`. root@ee16c88faf39:/# python Python 3.6.14 (default, Jul 22 2021, 16:21:31) [GCC 8.3.0] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import os >>> os.environ environ({ 'DATABASE_URL': 'postgresql://mydbuser:mysecretpass@thePGserver/db', 'HOSTNAME': '28b24b724f54', 'PYTHON_VERSION': '3.6.14', 'ENV': 'development', 'PWD': '/', 'HOME': '/root', 'LANG': 'C.UTF-8', 'GPG_KEY': '0D96DF4D4110E5C43FBFB17F2D347EA6AA65421D', 'TERM': 'xterm', 'SHLVL': '1', 'PYTHON_PIP_VERSION': '21.2.4', 'PYTHON_GET_PIP_SHA256': 'fa6f3fb93cce234cd4e8dd2beb54a51ab9c247653b52855a48dd44e6b21ff28b', 'PYTHON_GET_PIP_URL': 'https://github.com/pypa/get-pip/raw/c20b0cfd643cd4a19246ccf204e2997af70f6b21/public/get-pip.py', 'PATH': '/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin', '_': '/usr/local/bin/python' })
Django is one such framework that provides easily swappable email functionality, for example. On the email backends page we can see that email backends are easily swappable just by changing the EMAIL_BACKEND setting.
For example, with Python it’s generally understood that pip is used for package management (with a requirements.txt file) and virtualenv is used to isolate application dependencies from system dependencies. More recently, this can also be done with newer tools like Pipenv and Poetry.
These days, you’re likely already using a code versioning system, and it will most likely be git. There’s also other version control systems such as Subversion (svn) or Mercurial hg). This post will use concepts as it relates to git.
# Taken from: https://fastapi.tiangolo.com/advanced/async-sql-databases/?h=async+datab#import-and-set-up-sqlalchemy # This is a new import needed to use env vars import os import databases from fastapi import FastAPI # Now, we only need to define DATABASE_URL once, and it no longer contains # sensitive information. DATABASE_URL = os.environ.get('DATABASE_URL') # We should also check if our environment wasn't set up properly and raise if # `DATABASE_URL` wasn't set if not DATABASE_URL: raise AssertionError('DATABASE_URL not configured or detected. ' 'Please check your environment variables.') database = databases.Database(DATABASE_URL) # We can also do specific things if our app is running in development mode with this variable IS_DEVELOPMENT = os.environ.get('ENV') == 'development' if IS_DEVELOPMENT: print('My app is running in development mode') # Do other things... like set up local logging, connect to services only available on your local environment.
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