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Python 3.12

Built-in functions and methods, with a live in-browser demo where the semantics fit. No install, no waiting for a REPL to boot.

21 functions21 live demos

Sections

Functions & methods LIVE

Built-ins, string/list/dict/set methods, file objects.

Operators SOON

Arithmetic, comparison, logical, bitwise, walrus.

planned

Errors & exceptions SOON

TypeError, ValueError, KeyError, and the full hierarchy.

planned

Standard library LATER

os, json, datetime, re, and the modules devs actually reach for.

planned

Browse by type

Jump straight to the methods for a specific built-in type.

builtin5 str10 dict3 list3

Featured — try the live demos

01absLIVE 02str.capitalizeLIVE 03dict.popLIVE 04str.findLIVE 05dict.getLIVE 06str.joinLIVE

JSON, Base64, JWT, and more →

Client-side developer utilities — formatters, encoders, minifiers. Everything runs in your browser.

SQL reference →

Queries, clauses and functions for working with relational data.