Writing Your First Script (Hello World)

Welcome to your first Python script! This is the traditional starting point for learning any programming language. The Hello World script is a simple program that prints a message to the screen. It helps you verify that your Python environment is set up correctly and introduces you to the basic structure of a Python program.

⚙️ What You Need Before Starting

• Python installed on your machine (version 3.x recommended)
• A text editor or IDE (like VS Code, PyCharm, or even Notepad)
• A terminal or command prompt to run your script

🛠️ Creating Your First Script

Follow these steps to create and run your first Python script:

1. Create a new file and name it hello_world.py (the .py extension tells your system this is a Python file)
2. Open the file in your text editor
3. Write the following line into the file: print("Hello, World!")
4. Save the file

🕵️ Understanding the Code

Let's break down what you just wrote:

• print() is a built-in Python function that displays output to the screen
• The text "Hello, World!" is a string (a sequence of characters) enclosed in double quotes
• The parentheses () hold the information you want to print
• When Python runs this line, it executes the print function and shows the message

📊 Running Your Script

To execute your script, follow these steps:

1. Open your terminal or command prompt
2. Navigate to the folder where you saved hello_world.py
3. Type the following command and press Enter: python hello_world.py

Your expected output should be: Hello, World!

🔄 Common Variations You Can Try

Experiment with these simple modifications to see how Python handles different inputs:

• print("Hello, Engineers!") — changes the message
• print(42) — prints a number without quotes
• print("Hello" + " " + "World") — combines multiple strings using the + operator
• print("Hello", "World") — prints multiple items separated by a comma (adds a space automatically)

⚠️ Common Mistakes to Avoid

✅ Key Takeaways

• A Python script is simply a text file with a .py extension
• The print() function is your primary tool for displaying output
• Strings must be enclosed in quotes (single or double both work)
• Python executes your code line by line from top to bottom
• Always save your file before running it

🚀 Next Steps

Now that you've written and run your first script, try these challenges:

• Print your name and favorite programming language
• Print multiple lines using separate print() statements
• Print a simple calculation like print(2 + 3)

You've just taken your first step into Python programming. Every complex program starts with a simple print() statement — keep experimenting!

A Hello World script is the simplest Python program that prints text to the screen, confirming your environment works.

🖥️ Example 1: The simplest Hello World

This example prints the classic greeting using Python's built-in print() function.

print("Hello World")

📤 Output: Hello World

📝 Example 2: Hello World with a variable

This example stores the greeting text in a variable before printing it.

greeting = "Hello World"
print(greeting)

📤 Output: Hello World

👤 Example 3: Hello World with a name

This example prints a personalized greeting by combining text with a variable.

name = "Engineer"
print("Hello " + name)

📤 Output: Hello Engineer

🔤 Example 4: Hello World with formatted output

This example uses an f-string to insert a variable directly into the greeting text.

name = "Python"
print(f"Hello {name}")

📤 Output: Hello Python

🌍 Example 5: Hello World with user input

This example asks the user for their name and prints a personalized greeting.

user_name = input("Enter your name: ")
print(f"Hello {user_name}, welcome to Python!")

📤 Output: Hello [user input], welcome to Python!

Comparison Table

Welcome to your first Python script! This is the traditional starting point for learning any programming language. The Hello World script is a simple program that prints a message to the screen. It helps you verify that your Python environment is set up correctly and introduces you to the basic structure of a Python program.

⚙️ What You Need Before Starting

• Python installed on your machine (version 3.x recommended)
• A text editor or IDE (like VS Code, PyCharm, or even Notepad)
• A terminal or command prompt to run your script

🛠️ Creating Your First Script

Follow these steps to create and run your first Python script:

1. Create a new file and name it hello_world.py (the .py extension tells your system this is a Python file)
2. Open the file in your text editor
3. Write the following line into the file: print("Hello, World!")
4. Save the file

🕵️ Understanding the Code

Let's break down what you just wrote:

• print() is a built-in Python function that displays output to the screen
• The text "Hello, World!" is a string (a sequence of characters) enclosed in double quotes
• The parentheses () hold the information you want to print
• When Python runs this line, it executes the print function and shows the message

📊 Running Your Script

To execute your script, follow these steps:

1. Open your terminal or command prompt
2. Navigate to the folder where you saved hello_world.py
3. Type the following command and press Enter: python hello_world.py

Your expected output should be: Hello, World!

🔄 Common Variations You Can Try

Experiment with these simple modifications to see how Python handles different inputs:

• print("Hello, Engineers!") — changes the message
• print(42) — prints a number without quotes
• print("Hello" + " " + "World") — combines multiple strings using the + operator
• print("Hello", "World") — prints multiple items separated by a comma (adds a space automatically)

⚠️ Common Mistakes to Avoid

✅ Key Takeaways

• A Python script is simply a text file with a .py extension
• The print() function is your primary tool for displaying output
• Strings must be enclosed in quotes (single or double both work)
• Python executes your code line by line from top to bottom
• Always save your file before running it

🚀 Next Steps

Now that you've written and run your first script, try these challenges:

• Print your name and favorite programming language
• Print multiple lines using separate print() statements
• Print a simple calculation like print(2 + 3)

You've just taken your first step into Python programming. Every complex program starts with a simple print() statement — keep experimenting!

A Hello World script is the simplest Python program that prints text to the screen, confirming your environment works.

🖥️ Example 1: The simplest Hello World

This example prints the classic greeting using Python's built-in print() function.

print("Hello World")

📤 Output: Hello World

📝 Example 2: Hello World with a variable

This example stores the greeting text in a variable before printing it.

greeting = "Hello World"
print(greeting)

📤 Output: Hello World

👤 Example 3: Hello World with a name

This example prints a personalized greeting by combining text with a variable.

name = "Engineer"
print("Hello " + name)

📤 Output: Hello Engineer

🔤 Example 4: Hello World with formatted output

This example uses an f-string to insert a variable directly into the greeting text.

name = "Python"
print(f"Hello {name}")

📤 Output: Hello Python

🌍 Example 5: Hello World with user input

This example asks the user for their name and prints a personalized greeting.

user_name = input("Enter your name: ")
print(f"Hello {user_name}, welcome to Python!")

📤 Output: Hello [user input], welcome to Python!

Comparison Table