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Foundations & Setup

Stage 01 — Foundations and Setup

Building Your First Python CLI Toolkit (Hello Toolkit)

Python Cybersecurity Learning Path

Audience: Complete beginners (no prior programming experience required)

Welcome. In this stage you will learn the fundamental building blocks of Python and use them to build a real, working command-line program: the Hello Toolkit.

What You Will Learn and Why It Matters

Stage 01 is your foundation. Think of it like learning the alphabet before writing sentences. These basics will be reused constantly in later cybersecurity stages.

What You Will Build: “Hello Toolkit”

By the end of this stage, you will have created a command-line program that:

Skills You Will Gain (and why it matters)

The Milestones Approach

This stage is broken into small milestones so you can see progress clearly and build confidence.

Your Stage 01 Milestones

  1. Run your first Python program (Hello, World!)
  2. Write your first function
  3. Create a function that interacts with users
  4. Build a simple menu system
  5. Complete the Hello Toolkit with error handling
  6. Save your work to GitHub (commit + push)

Part 2 — Understanding the Basics: What is Python?

What is a Programming Language?

A programming language is how you give instructions to a computer. Computers require very precise instructions (spelling, punctuation, formatting all matter).

Analogy: A recipe

Code is like a recipe: step-by-step instructions that must be followed exactly.

Why Python?

Python is a strong first language because it is:

Key Vocabulary (you will see these terms often)

Part 3 — Milestone 1: Your First Program (“Hello, World!”)

Step-by-step

  1. Open your terminal:

    2. - Windows: Start → type cmd → Enter

    - Mac: Command + Space → type terminal → Enter

    - Linux: Ctrl + Alt + T

  1. Navigate to your Stage 01 folder (example):

    2. ```bash

    cd path/to/python-cybersecurity-learning-path/stage-starters/stage_01

  1. Create a file named hello.py in your code editor.
  1. Add this code:
print("Hello, World!")
  1. Run it:
python hello.py

You should see:

Hello, World!

What You Just Did (Quick Breakdown)

Common Mistakes (Avoid These)

Practice

Part 4 — Milestone 2: Understanding Functions

What Is a Function?

A function is a reusable block of code that performs a specific task. Instead of repeating code, you write it once and call it when needed.

Analogy: a vending machine

You provide input (selection), it performs a process, and gives output. You don’t need to know the internal details—just how to use it.

Anatomy of a Function (Example)

def greet_user(name):
    """Print a friendly greeting."""
    print(f"Hello, {name}! Welcome to the tool.")

Key Parts

Milestone 2 Exercise: Write and Run Your First Function

Create my_first_function.py:

# My first function

def say_hello():
    """Print a simple hello message."""
    print("Hello! This message came from my function!")

# Call the function
say_hello()

Run:

python my_first_function.py

Practice: Add More Functions

def say_goodbye():
    """Print a goodbye message."""
    print("Goodbye! Thanks for visiting!")

def show_welcome_banner():
    """Display a decorative welcome banner."""
    print("=" * 30)
    print("   Welcome to My Program!")
    print("=" * 30)

show_welcome_banner()
say_hello()
say_goodbye()

Part 5 — Milestone 3: Getting Information from Users with input()

Programs become more useful when they interact with users.

How input() Works

user_name = input("What is your name? ")
print(f"Nice to meet you, {user_name}!")

Milestone 3 Exercise: Interactive Function

Create interactive_greeting.py:

def greet_user():
    """Ask for the user's name and greet them."""
    name = input("What is your name? ")
    print(f"Hello, {name}! Welcome to the Hello Toolkit!")

greet_user()

Important: input() always returns text (a string), even if the user types numbers.

Part 6 — Making Decisions with if / elif / else

Programs often need to make choices based on conditions.

Basic if Example

age = 18

if age >= 18:
    print("You are an adult.")

Handling Multiple Options

choice = input("Enter 1, 2, or 3: ")

if choice == "1":
    print("You chose option one!")
elif choice == "2":
    print("You chose option two!")
elif choice == "3":
    print("You chose option three!")
else:
    print("Invalid choice. Please enter 1, 2, or 3.")

Critical Beginner Rule: = vs ==

Common Comparison Operators

Part 7 — Milestone 4: Loops and Menus

To build a menu-driven tool, you need a loop that keeps running until the user exits.

The while Loop (Concept)

A while loop repeats as long as its condition is True.

Milestone 4 Exercise: Basic Menu Loop

def show_menu():
    """Display the menu options."""
    print("\n=== Hello Toolkit ===")
    print("1. Say Hello")
    print("2. Say Goodbye")
    print("3. Exit")

running = True

while running:
    show_menu()
    choice = input("Enter your choice (1-3): ")

    if choice == "1":
        print("Hello there!")
    elif choice == "2":
        print("Goodbye, see you later!")
    elif choice == "3":
        print("Thanks for using the toolkit!")
        running = False
    else:
        print("Invalid choice. Please enter 1, 2, or 3.")

What’s Happening

Stage 01 Completion Checklist (Milestone 5–6 Targets)

Check off each item before moving on:

What’s Next: Stage 02 Preview

Stage 02 will build on these foundations by introducing:

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