Master Python Basics in 9 Minutes: From Hello World to Modules

1. Hello World

After installing Python, open IDLE (Python GUI), which is the interpreter where your statements run immediately. Type the classic hello‑world statement and press Enter to see the famous K&R introduction to programming.

Open a new editor window (File → New Window or Ctrl+N), write the following code, save it as a.py, and press F5 to run it. You can also double‑click the saved a.py file to see the result. Running Python scripts directly is an advantage over Java.

2. Internationalization Support

Create a new editor and write code that prints a greeting in a different language. When you save the file, Python may prompt you to change the file’s character set; select a more familiar encoding and the program runs correctly.

3. Convenient Calculator

Instead of using the cumbersome Windows calculator, you can perform calculations directly in the Python interpreter.

4. Strings, ASCII and UNICODE

Python can print predefined formatted strings. The tutorial shows how to access strings and highlights the differences between ASCII and UNICODE strings.

5. Using Lists

Python’s list type provides a convenient, easy‑to‑use data structure similar to Java’s List.

6. Conditional and Loop Statements

Examples of Python’s conditional statements and loops are presented.

7. Defining Functions

The tutorial introduces a handy function definition example.

8. File I/O

Basic file input/output operations are demonstrated.

9. Exception Handling

How to catch and handle exceptions in Python is explained.

10. Classes and Inheritance

Fundamental concepts of defining classes and using inheritance are covered.

11. Package Mechanism

Each .py file is a module; modules can import each other. A package is created by placing an __init__.py file (which can be empty) in each directory. The tutorial shows the directory structure, how Python discovers modules via sys.path, and ways to modify the module search path manually or via the PYTHONPATH environment variable.

12. Summary

The tutorial emphasizes that Python’s syntax is simple and its standard library is extensive, allowing programmers to quickly start coding without explicit type declarations. By mastering these basics, a programmer can transition from batch scripts to Python efficiently.