Python

Part 1: Starting out

Values and names, the numbers that cost money if you round them wrong, building readable text, and how to read an error.

1. 1Python from zero50 min · 4 steps

Part 2: Reading Python

Blocks, lists and dictionaries, the traps that catch newcomers, and your first functions that run.

1. 2Python basics35 min · 3 steps

Part 3: Decisions and loops

Conditions in the right order, refusing bad input early, building a result from a list, and the falsy-zero trap.

1. 3Decisions and loops50 min · 3 steps

Part 4: Collections

Slicing and sorting, dictionaries that count and group, sets for uniqueness, and the copy that was not a copy.

1. 4Lists, dictionaries and sets60 min · 4 steps

Part 5: Functions

Arguments and defaults, the default that remembers too much, returning rather than printing, and passing a function to a function.

1. 5Functions worth reusing55 min · 4 steps

Part 6: Text

Cleaning what people type, splitting a line into fields and back, and building slugs and references that are safe to use.

1. 6Working with text55 min · 4 steps

Part 7: When things go wrong

Catching the failure you expected and only that one, raising errors worth reading, and cleaning up whatever happens.

1. 7When things go wrong55 min · 3 steps