Free cheat sheets
Python Cheat Sheets
Quick, compact reference pages for the Python topics you use every day. You can browse each cheat sheet online, or you can download it as a printable PDF. Keep the most useful ones next to your keyboard, or use them as wallpaper behind your desk.
Python Essentials
Python Cheat Sheet
Setup, syntax, data types, variables, strings, control flow, functions, classes, errors, and I/O.
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Python Dev Environment Cheat Sheet
Terminal basics, uv and Python versions, uv projects, editor setup, venv and pip, REPLs and notebooks, Ruff, Git, pytest, and common fixes.
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Python 3.15 Cheat Sheet
Everyday syntax plus what's new: lazy imports, frozendict, sentinels, unpacking in comprehensions, and UTF-8 by default.
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Python Decorators Cheat Sheet
Basic decorators, arguments, functools.wraps, decorator factories, class-based decorators, and built-ins.
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Python itertools Cheat Sheet
Infinite iterators, islice and chain, batched and pairwise, combinatorics, accumulate, filtering, and groupby.
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Python Regex Cheat Sheet
Character classes, anchors, quantifiers, groups, lookarounds, flags, and the re module functions.
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Python File and Folder Automation Cheat Sheet
pathlib, globbing, reading and writing files, shutil, file metadata, zip archives, and bulk rename recipes.
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Python Time and Space Complexity Cheat Sheet
Big O basics and the costs of lists, strings, dicts, sets, deques, heaps, sorting, binary search, recursion, and caching.
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Python Security Checklist
Secrets, password hashing, encryption, HTTPS, input validation, injection, and dependency audits.
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Python Supply Chain Security Cheat Sheet
Incident checks, startup hook scans, incident response, dependency cooldowns, lock files, audits, agent guardrails, and Trusted Publishing.
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Git Cheat Sheet for Python Developers
Setup, staging and commits, .gitignore, diffs and logs, branches and merge conflicts, remotes, stash, and undoing mistakes.
View cheat sheet →AI Apps, Agents, and Tools
LLM APIs and MCP in Python Cheat Sheet
API calls in Python, messages and roles, structured outputs, tool calling, agent loops, and MCP servers and clients.
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Claude Code Cheat Sheet for Python Developers
Install, slash commands, CLI flags, keyboard shortcuts, CLAUDE.md, permissions, settings, hooks, skills, subagents, and MCP.
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Claude Code Hooks Cheat Sheet for Python Developers
settings.json layout, lifecycle events, matchers, the exit-code contract, and Python hook scripts.
View cheat sheet →Data Science and Machine Learning
pandas Cheat Sheet
read_csv, inspecting DataFrames, loc and iloc, filtering, missing data, groupby, pivot tables, and plotting.
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Polars Cheat Sheet
Expressions, loading, selecting, filtering, cleaning, group by, LazyFrames, and plotting.
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conda Cheat Sheet
Installing Miniconda, environments, packages, channels, environment.yml files, and pip inside conda.
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scikit-learn Workflow Cheat Sheet
Train-test splits, preprocessing, pipelines, fitting, metrics, cross-validation, and GridSearchCV.
View cheat sheet →Web Development
FastAPI Cheat Sheet
Routes, path and query parameters, Pydantic request bodies, responses, errors, dependencies, docs, and testing.
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