Your First Python Program

After installing Python successfully, the next step is to write and run your first Python program. Traditionally, the first program written in any programming language is called the “Hello, World!” program.

1. Writing Your First Program

Open IDLE, Command Prompt, Terminal, or any code editor and write the following code:


      print("Hello, World!")

This is the simplest Python program.

2. Understanding the print() Function

The print() function is used to display output on the screen.

In the program:

print is a built-in function in Python.
The text inside parentheses is called an argument.
The text inside quotation marks " " is called a string.

When Python executes this program, it displays:


      Hello, World!

This means Python has successfully executed your first program.

3. How Python Executes a Program

Python is an interpreted language. This means:

Python reads the program line by line.
It executes each line immediately.
If there is an error, it stops and shows the error message.

For example:


      print("Hello")

      print("Babu")

Output:


      Hello 

      Babu

Python executes the first line, then the second line in order.

4. Rules for Writing Python Code

Python is case-sensitive.
- Print() is incorrect
- print() is correct
Always use proper quotation marks for strings.
Maintain proper indentation in advanced programs.

5. Why “Hello, World!” is Important

This small program confirms:

Python is installed correctly.
Your editor is working properly.
You can write and execute Python code successfully.

It marks the beginning of your programming journey.