Python Data Types

BeginnerFoundations

Numbers, strings, lists, tuples, sets and dicts — internal representation, complexity and the mistakes that bite in production.

18 lessons 4 labs 1 projects ~9h

Prerequisites: Python Fundamentals

0%track

Lessons in this build

Lists & Tuples

Lists are ordered, mutable sequences; tuples are ordered, immutable ones. Knowing which to reach for — and the cost of each operation — is core Python fluency.

Sets & Frozensets

A set is an unordered collection of unique, hashable elements backed by a hash table — giving average O(1) membership tests, one-step de-duplication and fast set algebra.

Dictionaries & Hash Tables

Python's dict is a hash table offering average O(1) lookup, insertion-ordered since 3.7 — the workhorse behind objects, kwargs and namespaces.

interactive visualizer

Why it matters

Interview importance 5/5 · production importance 4/5.

Recommended next

Dictionaries & Hash Tables