Python Files and Modules: Structured Code and File I/O

Writing code in a single file quickly becomes unmanageable as your projects grow. Understanding how to structure your code into modules and interact with the file system is a critical milestone for any aspiring developer. This text-based course guides you through the core concepts of file input/output and modular programming in Python, starting from the absolute basics. You will transition from writing simple scripts to building organized, multi-file Python applications. Through clear explanations and structured code reading exercises, you will master how to persist data, handle file system paths safely, and design clean, reusable code structures. What you'll learn: - Understand how to open, read, write, and close files using safe context managers - Organize your code into custom Python modules and packages for better maintainability - Manage system paths reliably across different operating systems using modern libraries like pathlib - Parse and generate structured data formats including JSON and CSV files - Implement robust error handling to manage missing files and permission issues - Apply modern Python standards, including type hints, to make your modular code self-documenting We begin with foundational concepts, establishing how Python interacts with your operating system's file system, before moving on to module creation, import systems, and structured data handling. This course is designed specifically for beginners who have a basic grasp of Python variables and loops but want to learn how to build structured, real-world programs. No advanced programming experience is required. Start organizing your code and handling real-world data today.