Lists

Why it matters

Data comes in collections: rows from an export, a batch of headlines to score, the documents you'll search in a RAG system, the examples a model trains on. And when you call an LLM, the conversation you send is literally a list of messages. Lists are Python's default way to hold many things in order.

What you'll be able to do

• Create a list and read items and slices from it by position
• Add, change and remove items
• Summarize a list with len, sum, min, max and sorted
• Explain why two names can point at the same list, and make a real copy

Before this lesson

• Strings and f-strings

Next in this phase: Loops