Open‑Source Cheat Sheet Collection for Developers

Cheat sheets—originally small reference tables used in exams—are now valuable tools for developers to quickly locate syntax, commands, and code snippets, dramatically improving coding efficiency.

1. Language Cheat Sheets

1.1 Python (python‑cheatsheet)

Stars: 29.5k, not Chinese. Offers categorized references for common data types, functions, and libraries, enabling developers to fill in missing code instantly.

from threading import Thread, RLock, Semaphore, Event, Barrier
from concurrent.futures import ThreadPoolExecutor
= Thread(target=<function>)  # Use `args=<collection>` to set the arguments.
.start()                 # Starts the thread.
=
.is_alive()    # Checks if the thread has finished executing.
.join()                 # Waits for the thread to finish.

1.2 C++ (cpp‑cheatsheet)

Stars: 1.9k, not Chinese. Provides a concise reference for essential C++ syntax and common I/O patterns.

#include <iostream>          // Include iostream (std namespace)
cin >> x >> y;               // Read words x and y (any type) from stdin
cout << "x=" << 3 << endl; // Write line to stdout
cerr << x << y << flush;   // Write to stderr and flush
c = cin.get();               // c = getchar();
cin.get(c);                  // Read char
cin.getline(s, n, '\n');    // Read line into char s[n] to '\n' (default)
if (cin) { /* Good state (not EOF)? */ }

1.3 Rust (cheats.rs)

Stars: 2.9k, not Chinese. Supplies syntax quick‑look, execution order explanations, and extended resources such as examples, books, and standards.

1.4 JavaScript (modern‑js‑cheatsheet)

Stars: 23k, not Chinese. Contains abundant code examples to help developers overcome JavaScript syntax hurdles.

async function getUser() {
  // The returned promise will be rejected!
  throw "User not found !";
}
async function getAvatarByUsername(userId) => {
  const user = await getUser(userId);
  return user.avatar;
}
async function getUserAvatar(username) {
  var avatar = await getAvatarByUsername(username);
  return { username, avatar };
}
getUserAvatar('mbeaudru')
  .then(res => console.log(res))
  .catch(err => console.log(err)); // "User not found !"

2. Command Cheat Sheets

2.1 Git (git‑tips)

Stars: 13.9k, Chinese version available. Offers searchable Git commands for everyday and special‑case scenarios.

# Delete branches already merged into master
git branch --merged master | grep -v '^\*\|  master' | xargs -n 1 git branch -d

2.2 Linux (linux‑command)

Stars: 19k, Chinese version available. A searchable repository of common Linux commands with Chinese support.

2.3 Kubernetes (cheatsheet‑kubernetes‑A4)

Stars: 1.5k, not Chinese. Presents frequently used Kubernetes commands on a printable A4 sheet; a Docker version is also provided.

3. Comprehensive Cheat Sheets

3.1 Data Processing (ds‑cheatsheets)

Stars: 10.7k, not Chinese. Covers SQL, R, Pandas, Jupyter, big data, and visualization, offering high‑quality printable PDFs.

3.2 Online Site (cheatsheets)

Stars: 11.8k, not Chinese. An open‑source website aggregating cheat sheets for front‑end, back‑end, operations, and IDEs.

3.3 Command‑Line (cheat.sh)

Stars: 29.2k, not Chinese. Provides a universal cheat sheet accessible via terminal or web, billed as “the only cheat sheet you’ll ever need.”

In conclusion, these open‑source cheat sheets serve as quick‑reference tools that not only streamline development but also help consolidate knowledge, encouraging developers to create, maintain, and share their own “knowledge weapons.”