Practical Python: Learn Python Basics Step by Step- Python 3 - Functions

The video tutorial introduces functions as reusable blocks of code that simplify programming by reducing complexity and keeping code clean. It explains how to create a function using the 'def' keyword, followed by the function name and proper indentation. The tutorial also covers calling a function to execute its code and demonstrates the reusability of functions by calling them multiple times. The importance of defining a function before calling it is emphasized to avoid errors.

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