Python - Lesson 1.2: Variables, Data Types, and Type Conversion

Welcome back to the Python for Real Applications Course! In this session, we move from the initial setup (Lesson 1.1) straight into the foundational building blocks of all programming: variables and data types.
Mastering this core knowledge is crucial for writing clean, powerful code for AI, Data Analytics, and Gaming.
What You Will Master in This Lesson
This lesson provides the essential theory and hands-on practice needed to store, label, and manipulate data in Python:
• Understanding Variables: Learn what variables are, how they work as labels for memory, and the rules for naming them correctly (good practices vs. bad practices).
• Core Data Types: Deep dive into Python's primary data types: str (text), int (whole numbers), float (decimals), and bool (True/False logic). We'll also use the type () function to inspect our data.
• Type Conversion: Discover how and why to convert data from one type to another (e.g., turning user input text into a usable number) using functions like int(), str(), and float().
• Reserved Words: We'll review Python's reserved keywords that you must avoid using as variable names to prevent errors.
Key Concepts Covered
• Variables and assignment
• str, int, float, bool
• type() function
• Type Casting (int(), str(), float())
• Naming conventions (Snake Case)
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Get Ready for the Next Lesson