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Binary Search Explained

Learn how binary search halves a sorted list, trace a worked example, and implement it in Python with O(log n) time and O(1) extra space.

Binary Search Tree Explained

Understand binary search trees, search and insertion in Python, tree traversals, and why balanced trees keep operations fast.

Conditional Statements

Make your programs choose between different paths with if, elif, and else.

Dictionaries

Store data as key-value pairs and look things up by name instead of by position.

Functions

Package code into reusable, named blocks with parameters and return values.

Hello, World!

Write one line of Python, see it print a greeting, then try your first puzzle.

Lists

Store ordered collections of values and learn to add, remove, sort, and loop over them.

Loops

Repeat actions with while and for loops, and control them with break and continue.

Operators

Do math, compare values, and combine conditions with Python's operators.