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 -- Immutabl