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Introduction =============

This project was started to bring together useful Python code snippets that make coding faster, easier, and more enjoyable. You can explore all the cheat sheets at Pysheeet <https://www.pythonsheets.com/>_. Contributions are always welcome—feel free to fork the repo and submit a pull request to help it grow!

Plugin ======

pysheeet is available as a Claude Code plugin. Once installed, Claude automatically uses the cheat sheets to answer Python questions — just ask naturally and the skill triggers based on context.

Installation

As a Claude Code plugin (recommended):

.. code-block:: bash

# Step 1: Add the marketplace claude plugin marketplace add crazyguitar/pysheeet

# Step 2: Install the plugin claude plugin install pysheeet@pysheeet

Local testing (single session only):

.. code-block:: bash

claude --plugin-dir /path/to/pysheeet

Manual installation (requires cloning the repo):

.. code-block:: bash

git clone https://github.com/crazyguitar/pysheeet.git mkdir -p ~/.claude/skills cp -r pysheeet/skills/py ~/.claude/skills/py

Python Interview Cheatsheet ===========================

Curated Python interview questions indexed by topic — each question links directly to the section of the cheat sheet that answers it. Use it for quick review before an interview, or to drill down on a specific area (GIL, asyncio, decorators, MRO, and more).

• Python Interview Cheatsheet <docs/notes/interview/index.rst>_

This part only provides a quick glance at some important features in Python 3. If you're interested in all of the most important features, please read the official document, What’s New in Python <https://docs.python.org/3/whatsnew/index.html>_.

• New in Python3 <docs/notes/python-new-py3.rst>_

Cheat Sheet ===========

Core Python fundamentals including data types, functions, classes, and commonly used patterns for everyday programming tasks.

• From Scratch <docs/notes/basic/python-basic.rst>_
• Future <docs/notes/basic/python-future.rst>_
• Typing <docs/notes/basic/python-typing.rst>_
• Class <docs/notes/basic/python-object.rst>_
• Function <docs/notes/basic/python-func.rst>_
• Unicode <docs/notes/basic/python-unicode.rst>_
• List <docs/notes/basic/python-list.rst>_
• Set <docs/notes/basic/python-set.rst>_
• Dictionary <docs/notes/basic/python-dict.rst>_
• Heap <docs/notes/basic/python-heap.rst>_
• Generator <docs/notes/basic/python-generator.rst>_
• Regular expression <docs/notes/basic/python-rexp.rst>_

System ======

Date/time handling, file I/O, and operating system interfaces.

• Datetime <docs/notes/os/python-date.rst>_ - Timestamps, formatting, parsing, timezones, timedelta
• Files and I/O <docs/notes/os/python-io.rst>_ - Reading, writing, pathlib, shutil, tempfile
• Operating System <docs/notes/os/python-os.rst>_ - Processes, environment, system calls

Concurrency ===========

Threading, multiprocessing, and concurrent.futures for parallel execution. Covers synchronization primitives, process pools, and bypassing the GIL.

• Threading <docs/notes/concurrency/python-threading.rst>_ - Threads, locks, semaphores, events, conditions
• Multiprocessing <docs/notes/concurrency/python-multiprocessing.rst>_ - Processes, pools, shared memory, IPC
• concurrent.futures <docs/notes/concurrency/python-futures.rst>_ - Executors, futures, callbacks

Asyncio =======

Asynchronous programming with Python's `asyncio module. Covers coroutines, event loops, tasks, networking, and advanced patterns.

• A Hitchhiker's Guide to Asynchronous Programming _ - Design philosophy and evolution
• Asyncio Basics _ - Coroutines, tasks, gather, timeouts
• Asyncio Networking _ - TCP/UDP servers, HTTP, SSL/TLS
• Asyncio Advanced _ - Synchronization, queues, subprocesses

• ctypes _ - Load shared libraries without compilation
• Python C API _ - Traditional C extension reference
• Modern C/C++ Extensions _ - pybind11, Cython
• Learn C++ from Python _ - Modern C++ for Python developers

• Modern Cryptography _ - AES-GCM, RSA-OAEP, Ed25519, Argon2
• TLS/SSL and Certificates _ - HTTPS servers, certificate generation
• Common Vulnerabilities _ - Padding oracle, injection, timing attacks

• Socket Basics _
• Socket Servers _
• Async Socket I/O _
• SSL/TLS Sockets _
• Packet Sniffing _
• SSH and Tunnels _

• SQLAlchemy Basics _
• SQLAlchemy ORM _
• SQLAlchemy Query Recipes _

• PyTorch _ - Tensors, autograd, neural networks, training loops
• Megatron _ - NVIDIA Megatron training/fine-tuning framework with enroot/pyxis
• LLM Serving _ - vLLM and SGLang for production inference with TP/PP/DP/EP
• LLM Benchmark _ - Benchmark suite for measuring serving performance

• Slurm _
• Ray Cluster _

• NVSHMEM Multi-NIC Support with AWS EFA _
• Is Disaggregated Prefill/Decode a Silver Bullet for LLM Serving? _
• Monitoring EFA with NCCL GIN and Nsys _
• GPU-Initiated Networking for NCCL on AWS _
• PEP 572 and the walrus operator _
• Python Interpreter in GNU Debugger _

pdf`_

.. _pdf: https://media.readthedocs.org/pdf/pysheeet/latest/pysheeet.pdf

How to run the server =======================

.. code-block:: bash

$ virtualenv venv $ . venv/bin/activate $ pip install -r requirements.txt $ make $ python app.py

# URL: localhost:5000