The Python Cheat Sheet You'll Actually Use

We all do it. We've written Python for years, and we still Google "python string format" or "how to sort a dictionary" at least once a week. No shame in it -- but what if you had everything in one place? This is the Python cheat sheet I keep pinned next to my monitor. It covers Python 3.10+ and includes the stuff you actually use, not the obscure corner cases you'll never need. Data Types & Variables # Core Types x: int = 42 y: float = 3.14 z: complex = 2 + 3j s: str = "hello" b: bool = True # True / False n: None = None # Type Checking & Conversion type(x) # <class 'int'> isinstance(x, int) # True isinstance(x, (int, float)) # True -- checks multiple int("42"), float("3.14") # parse from string str(42), bool(0) # 0 -> False, anything else -> True Type Quick Reference int -- Immutable, not ordered float -- Immutable, not ordered str -- Immutable, ordered, allows duplicates list -- Mutable, ordered, allows duplicates tuple -- Immutable, ordered, a