Functions, imports and modules

After this lesson you can: Split code into functions and import across files.

First: Python crash course

Watch

• Python Tutorial for Beginners 8: Functions - Corey Schafer, 22 min. Focused beginner-friendly functions lesson from a trusted Python teaching channel, ideal before splitting scripts.
• Python Tutorial for Beginners 9: Import Modules and Exploring The Standard Library - Corey Schafer, 22 min. Directly covers importing modules and standard library usage, the missing piece after defining functions.
• Python Functions | Python Tutorial for Absolute Beginners #1 - Programming with Mosh, 31 min. A clear zero-level functions explainer for developers who need stronger function-structuring habits.

Notes

A function is a named chunk of code with inputs and an output. Instead of writing every step in one long file, you give repeated or meaningful work a name: load_data, clean_row, call_model, save_results. That name becomes part of your program’s vocabulary, which makes the code easier to read, test, debug, and reuse.

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