Hello World

Introduction

Your first Python program is one line: print('Hello, World!'). No boilerplate, no main function required — just save and run.

Understanding the topic

Core concepts to understand:

• print() writes to stdout.
• Strings can use single or double quotes.
• Run with python file.py.

Syntax reference

Visual flow / code:

# hello.py
print("Hello, World!")
print(f"1 + 1 = {1 + 1}")

# Run
$ python hello.py
Hello, World!
1 + 1 = 2

Execution workflow

Real-world use

Python's lack of ceremony is why scripts and prototypes ship in minutes, not hours.

Best practices

• Use f-strings for formatting.
• Files end in .py.
• Add a shebang for executable scripts: #!/usr/bin/env python3.

Hands-on exercise

Interview preparation — practice these questions:

• How do you run a Python file?
• What's an f-string?
• Why no semicolons?

Summary

In summary: Zero-ceremony scripts. f-strings are the modern default.