Environment variables usage in Python - Mini Project: Build & Apply

Environment variables usage

📖 Scenario: Imagine you are creating a simple program that needs to use a secret key to access a service. Instead of writing the secret key directly in your code, you will use environment variables to keep it safe and separate.

🎯 Goal: You will learn how to read environment variables in Python and use them in your program.

📋 What You'll Learn

Create an environment variable named SECRET_KEY with the value abc123 in your system before running the program.

Use the os module to access environment variables.

Store the environment variable value in a variable called secret_key.

Print the value of secret_key.

💡 Why This Matters

🌍 Real World

Environment variables are used to keep sensitive information like keys and passwords out of the code, making programs safer and easier to manage.

💼 Career

Many jobs require working with environment variables to configure applications securely, especially in web development and cloud computing.

1

Import the os module

Write import os to import the module needed to access environment variables.

Python

# Your code here

Need a hint?

The os module helps you work with environment variables.

2

Read the environment variable

Create a variable called secret_key and set it to the value of the environment variable SECRET_KEY using os.getenv.

Python

import os
# Your code here

Need a hint?

Use os.getenv('SECRET_KEY') to get the value of the environment variable.

3

Check if the environment variable is set

Write an if statement to check if secret_key is None. If it is, set secret_key to the string 'No key found'.

Python

import os
secret_key = os.getenv('SECRET_KEY')
# Your code here

Need a hint?

This helps your program handle the case when the environment variable is not set.

4

Print the secret key

Write print(secret_key) to display the value of the secret_key variable.

Python

import os
secret_key = os.getenv('SECRET_KEY')
if secret_key is None:
    secret_key = 'No key found'
# Your code here

Need a hint?

This will show the secret key if it is set, or the message if not.