Lists, dicts and loops

After this lesson you can: Reach for the right container and iterate over it cleanly.

First: Python crash course

Watch

• Python Tutorial for Beginners 4: Lists, Tuples, and Sets - Corey Schafer, 29 min. Clear beginner-friendly coverage of Python sequence containers, essential before choosing how to iterate data.
• Python Tutorial for Beginners 5: Dictionaries - Working with Key-Value Pairs - Corey Schafer, 10 min. Focused dictionary lesson from a trusted Python teacher, matching key-value container decisions directly.
• Python For Loops - Python Tutorial for Absolute Beginners - Programming with Mosh, 15 min. Short loop-focused beginner tutorial that supports replacing index-based habits with Pythonic iteration.

Notes

Lists are for ordered collections: a batch of filenames, rows, prompts, predictions, or errors where position matters or duplicates are normal. Dictionaries are for lookups by name: configuration values, counts by label, user records by ID, or model metrics by split. The first question is not “what syntax do I remember?” but “will I usually process items in order, or retrieve a value by a key?”

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