Standard Library

12 pages in this section.

Why "batteries included" is a design contract, not a marketing phrase - how pathlib/os, datetime/zoneinfo, json, re, and subprocess each own one stable platform job, and how to decide when a PyPI package earns its place instead.

Explainer Python Stdlib Module Ownership

Standard Library Overview

A map of the batteries and what to reach for.

Python Standard Library Overview Stdlib

pathlib & os

Filesystem paths, globbing, and OS interaction.

Python Standard Library Pathlib Os

datetime, zoneinfo & time

Dates, times, timezones, and durations.

Python Standard Library Datetime Zoneinfo

json & Serialization

Parsing, custom encoders, and streaming JSON.

Python Standard Library Json Serialization

re - Regular Expressions

Patterns, groups, flags, and a Python regex reference.

Python Standard Library Regex Re

subprocess

Running external commands safely and capturing output.

Python Standard Library Subprocess Shell

collections, itertools & functools Recap

Cross-links to the toolkit modules.

Python Standard Library Collections Itertools

dataclasses, enum & contextlib

The ergonomic-code trio.

Python Standard Library Dataclasses Enum

argparse & configparser

Args and config files without dependencies.

Python Standard Library Argparse Configparser

hashlib, secrets & uuid

Hashing, tokens, and identifiers.

Python Standard Library Hashlib Secrets

Standard Library Best Practices

Prefer stdlib before adding a dependency.

Python Standard Library Best Practices List

Standard Library

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Standard Library