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#pip (81)

Cheat sheets (81)

anyio — Structured Concurrency Across asyncio and trio

Package-level reference for anyio on PyPI — install, version policy, task groups, cancel scopes, and the API that runs identically on asyncio and trio.
pip package async concurrency networking

attrs — Classes Without Boilerplate

Package-level reference for attrs on PyPI — install, @define vs @attr.s, validators, converters, and comparison with dataclasses.
pip package dataclass language

autogen-agentchat — Microsoft AutoGen v0.4 Multi-Agent SDK

Package-level reference for the autogen-agentchat / autogen-core / autogen-ext family on PyPI plus the legacy pyautogen — install, rename history, versioning, and alternatives.
pip package llm ai agents multi-agent microsoft

beautifulsoup4 — HTML/XML Parsing Library

Package-level reference for beautifulsoup4 on PyPI — install variants, parser-backend selection (lxml/html5lib/html.parser), and alternatives.
pip package scraping html parsing

black — The Uncompromising Python Formatter

Package-level reference for black on PyPI — install variants, version policy, the [d] and [jupyter] extras, and how it relates to ruff format.
pip package formatting code-quality

boto3 — AWS SDK for Python

Package-level reference for boto3 on PyPI — install, sessions, clients vs resources, paginators, version policy, and alternatives.
pip package aws cloud sdk

certifi — Mozilla CA Certificate Bundle

Package-level reference for certifi on PyPI — what the bundle contains, install, integration with requests / urllib3 / ssl, alternatives.
pip package tls security http

cffi — C Foreign Function Interface for Python

Package-level reference for cffi on PyPI — install, ABI vs API modes, build patterns, and integration with system libraries.
pip package binding c ffi

charset-normalizer — Character Encoding Detection

Package-level reference for charset-normalizer on PyPI — what it does, install, integration with requests, version policy, and alternatives.
pip package encoding text http

chromadb — Embedded Vector Database

Package-level reference for chromadb on PyPI — install variants, server/client split, embedding-function extras, and alternative vector stores.
pip package ai vector-search rag embeddings

click — Composable Command-Line Builder

Package-level reference for the click CLI toolkit on PyPI — install, version policy, extras, and alternatives.
pip package cli terminal

crewai — Role-Based Multi-Agent Orchestration

Package-level reference for the crewai library on PyPI plus the crewai-tools companion — install, versioning, and multi-agent alternatives.
pip package llm ai agents multi-agent

cryptography — Recipes and Hazmat for Python Crypto

Package-level reference for the cryptography library on PyPI — install, version policy, Fernet, asymmetric keys, X.509, and TLS contexts.
pip package crypto security tls

dagster — Asset-Oriented Data Orchestration

Package-level reference for Dagster on PyPI — install variants, the dagster-* plugin family, version policy, and alternatives.
pip package orchestration pipelines

django — The Batteries-Included Web Framework

Package-level reference for Django on PyPI — install variants, LTS release cadence, ecosystem companions, and alternatives.
pip package web api

dspy — Declarative LLM Programming

Package-level reference for DSPy on PyPI — the dspy / dspy-ai rename, install variants, version policy, and alternatives.
pip package ai llm

duckdb — Embedded Analytical SQL

Package-level reference for duckdb — install, versioning, extensions, and gotchas. In-process columnar OLAP for Python.
pip package duckdb sql analytics

fastapi — Modern ASGI API Framework

Package-level reference for FastAPI on PyPI — install variants, version policy, the `[all]` extra, ecosystem companions, and alternatives.
pip package web async api

flask — The WSGI Microframework

Package-level reference for Flask on PyPI — install variants, version policy, extension ecosystem, and alternatives.
pip package web api

fsspec — Filesystem Spec Abstraction

Package-level reference for fsspec on PyPI — install, protocols, chained URIs, caching layers, and integration with pandas / dask.
pip package fs storage

google-genai — Google Gemini SDK (successor to google-generativeai)

Package-level reference for google-genai (the current Gemini SDK) and its predecessor google-generativeai — install, auth, versioning, and alternatives.
pip package llm ai google gemini api

guidance — Programmatic LLM Output Control

Package-level reference for the guidance library on PyPI — install, LLM-provider extras, versioning, and alternatives like instructor and outlines.
pip package llm ai structured-output prompting

haystack-ai — LLM Pipelines from deepset

Package-level reference for haystack-ai on PyPI — install variants, the farm-haystack v1 → haystack-ai v2 rename, integrations, and alternative frameworks.
pip package ai rag agents

httpx — Async-Capable HTTP Client

Package-level reference for httpx on PyPI — install variants, version policy, extras, transport options, and alternatives.
pip package http async networking

idna — Internationalised Domain Names

Package-level reference for idna on PyPI — IDNA2008 vs UTS46, encode/decode, install, integration with requests / urllib3, alternatives.
pip package dns unicode networking

importlib-metadata — Backport of stdlib importlib.metadata

Package-level reference for importlib-metadata on PyPI — install, distribution lookups, entry points, and the stdlib relationship from Python 3.10+.
pip package language

jinja2 — Python Template Engine

Package-level reference for Jinja2 on PyPI — install, version policy, autoescape gotchas, sandboxing, and the template features behind Flask, Ansible, and Sphinx.
pip package template web rendering

jupyter — Meta-Package for Interactive Notebooks

Package-level reference for the jupyter meta-package on PyPI — install variants, what it pulls in, version policy, and alternatives.
pip package notebooks interactive data

langchain — LLM Application Framework Family

Package-level reference for the langchain family on PyPI — install variants, partner packages, version churn, and alternatives.
pip package llm ai langchain agents rag

langsmith — LLM Observability SDK

Package-level reference for the langsmith SDK on PyPI — install, versioning, env-var setup, and observability alternatives.
pip package llm ai observability evaluation tracing

litestar — High-Performance ASGI Framework

Package-level reference for Litestar on PyPI — install variants, version policy, the `[full]` extra, ecosystem companions, and alternatives.
pip package web async api

loguru — Zero-Config Structured Logging

Package-level reference for loguru on PyPI — install variants, version policy, and how it coexists with (does not replace) the stdlib logging module.
pip package logging debugging

markupsafe — Safe String Escaping for HTML/XML

Package-level reference for markupsafe on PyPI — install, the Markup class, escape semantics, and its role as a Jinja2/Flask/Django dependency.
pip package template web security

matplotlib — Foundational Python Plotting Library

Package-level reference for matplotlib on PyPI — install variants, backends, version policy, extras, and alternatives.
pip package plotting visualization data

modin — Drop-in Parallel pandas

Package-level reference for modin — install, backend extras, versioning, and gotchas. Speeds up existing pandas code with a one-line import swap.
pip package modin pandas parallel

mypy — Reference Static Type Checker for Python

Package-level reference for mypy on PyPI — install variants, Python compat, the types-* stub-package ecosystem, and alternatives.
pip package typing static-analysis

numpy — N-Dimensional Array Foundation

Package-level reference for numpy — install, versioning, ABI breaks, extras, and gotchas. The bedrock of the Python scientific stack.
pip package numpy arrays scientific

packaging — Version Parsing and Requirement Specifiers

Package-level reference for packaging on PyPI — Version, SpecifierSet, Requirement, markers, install, alternatives.
pip package versioning metadata pep

pandas — DataFrames for Python

Package-level reference for pandas — install, versioning, Python compatibility, extras, and gotchas. The de-facto DataFrame library on PyPI.
pip package pandas dataframes data

Pillow — Friendly PIL Fork for Image I/O

Package-level reference for Pillow on PyPI — install variants, format-specific native deps, version policy, and alternatives.
pip package images imaging filesystem

platformdirs — Cross-Platform User Directories

Package-level reference for platformdirs on PyPI — install, version policy, alternatives, and the per-OS path conventions it returns.
pip package paths filesystem configuration

pluggy — Plugin Framework Behind pytest

Package-level reference for pluggy on PyPI — install, version policy, alternatives, and the hookspec/hookimpl model that powers pytest, tox, and devpi.
pip package plugin extensibility entry-points

polars — Fast DataFrames on Rust + Arrow

Package-level reference for polars — install, versioning, extras, and gotchas. The Rust-powered Arrow-native alternative to pandas.
pip package polars dataframes arrow

pre-commit — Multi-Language Git-Hook Framework

Package-level reference for pre-commit on PyPI — install variants, hook-pinning model, and how it composes with ruff, black, and mypy.
pip package git-hooks code-quality

prefect — Python Workflow Orchestration

Package-level reference for Prefect on PyPI — install variants, version policy, cloud-vs-OSS extras, and alternatives.
pip package orchestration pipelines

protobuf — Google Protocol Buffers for Python

Package-level reference for the protobuf package on PyPI — install, backend selection (upb / pure-Python / C++), .proto compilation, and gRPC integration.
pip package serialization rpc

pycparser — Pure-Python C Parser

Package-level reference for pycparser on PyPI — install, AST walking, fake stdlib headers, and use as a cffi dependency.
pip package binding c

pydantic — Type-Driven Data Validation

Package-level reference for Pydantic on PyPI — install variants, v1 vs v2 split, optional extras, and alternatives.
pip package validation json

pygments — Syntax Highlighter Library

Package-level reference for Pygments on PyPI — install, version policy, lexers, formatters, and the pygmentize CLI it ships.
pip package syntax-highlighting formatting docs

pytest — The De-Facto Python Test Framework

Package-level reference for pytest on PyPI — install variants, version policy, the pytest-* plugin ecosystem, and alternatives.
pip package testing tdd

python-dateutil — Date Parsing, Deltas, and Recurrence

Package-level reference for python-dateutil on PyPI — parser, relativedelta, rrule, timezone, install, alternatives.
pip package datetime timezone parsing

PyYAML — YAML Parser and Emitter

Package-level reference for PyYAML on PyPI — safe_load vs load, dump, custom tags, install, alternatives like ruamel.yaml.
pip package yaml config parsing

qdrant-client — Python Client for Qdrant

Package-level reference for qdrant-client on PyPI — install variants, server version matching, gRPC vs HTTP, fastembed extras, and alternatives.
pip package ai vector-search rag embeddings

ragas — RAG Evaluation Framework

Package-level reference for ragas on PyPI — install variants, LLM-as-judge dependencies, metric churn, and alternative evaluators.
pip package ai rag evaluation

reflex — Full-Stack Python Web Framework

Package-level reference for reflex on PyPI — install variants, Node.js requirement, version policy, and alternatives.
pip package web fullstack ui

requests — The Most-Downloaded Python Package

Package-level reference for the requests HTTP client on PyPI — install variants, version policy, extras, and alternatives.
pip package http networking

rich — Beautiful Terminal Output for Python

Package-level reference for rich on PyPI — install variants, single-file design, version policy, and alternatives.
pip package terminal cli tui

ruff — Rust-Powered Python Linter & Formatter

Package-level reference for ruff on PyPI — install variants, fast-moving version policy, and how a single binary subsumes flake8, isort, pyupgrade, and black.
pip package linting formatting code-quality

scikit-learn — Classical Machine Learning

Package-level reference for scikit-learn — install, versioning, extras, and gotchas. The de-facto classical-ML library on PyPI.
pip package scikit-learn ml modelling

scipy — Scientific Algorithms on NumPy

Package-level reference for scipy — install, versioning, submodules, license caveats, and gotchas. Optimization, statistics, signal processing, and linear algebra.
pip package scipy scientific statistics

semantic-kernel — Microsoft's LLM Orchestration SDK

Package-level reference for semantic-kernel on PyPI — install variants, the Python vs .NET split, provider extras, and alternative frameworks.
pip package ai agents async

sentence-transformers — Embedding & Reranking Models

Package-level reference for the sentence-transformers library on PyPI — install, transformers/torch deps, model registry, and embedding alternatives.
pip package llm ai embeddings rag huggingface

six — Python 2/3 Compatibility (Mostly Legacy in 2026)

Package-level reference for six on PyPI — what it did, why it still appears in dependency trees, and why new code should avoid it.
pip package compatibility legacy python2

SQLAlchemy — The Python SQL Toolkit & ORM

Package-level reference for SQLAlchemy on PyPI — install variants, dialect drivers, version policy, extras, and alternatives.
pip package orm sql database

sqlmodel — Pydantic + SQLAlchemy Fusion

Package-level reference for SQLModel on PyPI — install, version policy, dependencies, and alternatives.
pip package orm sql database

streamlit — Data Apps Framework on PyPI

Package-level reference for the streamlit framework on PyPI — install variants, version policy, extras, and alternatives.
pip package web dataviz ui

tqdm — Fast, Extensible Progress Bars

Package-level reference for tqdm on PyPI — install variants, notebook extra, version policy, and alternatives.
pip package progress cli async

transformers — Hugging Face Model Library

Package-level reference for the Hugging Face transformers library on PyPI — install extras, backend choice, versioning, and alternatives.
pip package llm ai huggingface nlp ml

trulens-eval — LLM App Evaluation and Tracing

Package-level reference for trulens-eval on PyPI — install variants, the trulens umbrella rename, framework extras, and alternative evaluators.
pip package ai rag evaluation observability

typer — Type-Hint-Driven CLI Framework

Package-level reference for the Typer CLI library on PyPI — install variants, version policy, extras, and alternatives.
pip package cli terminal

typing-extensions — Backported and Experimental Typing Features

Package-level reference for typing-extensions on PyPI — what's backported, install, version policy, and migration to stdlib.
pip package typing mypy backport

unstructured — Document Parsing for RAG Pipelines

Package-level reference for unstructured on PyPI — install variants, the huge extras tree, system-level dependencies, and alternative parsers.
pip package ai rag filesystem

urllib3 — Low-Level HTTP Client

Package-level reference for urllib3 on PyPI — connection pooling, retries, TLS, version policy, and alternatives.
pip package http networking tls

weaviate-client — Python Client for Weaviate

Package-level reference for weaviate-client on PyPI — install variants, the v3 → v4 API split, gRPC, and alternative vector stores.
pip package ai vector-search rag embeddings

Packages

Cheat sheets for individual libraries and modules across language ecosystems — pip, npm, Cargo, and Go.
packages libraries ecosystem pip npm cargo go

Pip Packages

Cheat sheets for third-party PyPI packages — HTTP clients, data tools, validation, terminal UIs, and more.
packages pip python pypi libraries

Essential Python Packages

Overview of the 34 most useful Python packages — HTTP clients, data science, web frameworks, orchestration, testing, and tooling. Each has its own dedicated page with examples.
python packages pip overview

pip vs uv — Package Manager Comparison

Side-by-side feature comparison of pip and uv — speed, lock files, virtual envs, Python version management, and when to use each.
python package-management pip uv

uv — Fast Python Package Manager

Install packages and manage virtual environments blazingly fast with uv. Covers uv pip, uv venv, uv run, uv init, and how it compares to pip and poetry.
python uv pip packaging venv tools astral

Virtual Environments — venv

Create, activate, and manage Python virtual environments with venv. Covers activation for every shell, pip usage, requirements files, and cleanup.
python venv virtualenv pip packaging

pip — Python Package Installer

Complete pip reference covering installation, package management, requirements files, private registries, caching, offline installs, and reproducible builds.
python pip packages cli packaging