In Python Code Verified May 2026

def deposit(self, amount: float) -> None: if amount <= 0: raise ValueError("Deposit must be positive") self._balance += amount

# Ugly (C-style loop) i = 0 while i < len(items): print(items[i]) i += 1 for item in items: print(item) 2. Core Structures Expressed in Python Code Lists & List Comprehensions # Creating and transforming numbers = [1, 2, 3, 4] squares = [n**2 for n in numbers] # [1, 4, 9, 16] evens = [n for n in numbers if n % 2 == 0] # [2, 4] Dictionaries & Dict Comprehensions users = "alice": 25, "bob": 30 ages_plus_10 = name: age+10 for name, age in users.items() # 'alice': 35, 'bob': 40 Sets & Set Operations A = 1, 2, 3 B = 3, 4, 5 print(A | B) # union: 1,2,3,4,5 print(A & B) # intersection: 3 3. Functions – The Heart of Python Code Define behavior cleanly with type hints (Python 3.5+): in python code

def greet(name: str, excited: bool = False) -> str: """Return a greeting.""" message = f"Hello, name" return message.upper() + "!!!" if excited else message print(greet("Maria", excited=True)) # HELLO, MARIA!!! def log(level, *messages, **metadata): print(f"[level.upper()]", *messages, metadata) log("info", "User login", "IP 192.168.1.1", user="alice") [INFO] User login IP 192.168.1.1 'user': 'alice' 4. Classes – Modeling in Python Code Python classes are straightforward. No need for getters/setters (use @property when needed). def deposit(self, amount: float) -&gt; None: if amount