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def retry(max_attempts=3, delay=1, backoff=2): def decorator(func): @wraps(func) def wrapper(*args, **kwargs): attempts = 0 current_delay = delay while attempts < max_attempts: try: return func(*args, **kwargs) except Exception as e: attempts += 1 if attempts == max_attempts: raise print(f"Attempt {attempts} failed: {e}. Retrying in {current_delay}s") time.sleep(current_delay) current_delay *= backoff return wrapper return decorator

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def add(a, b): return a + b

add = logger(add) # manual decoration print(add(3, 5)) @logger def multiply(a, b): return a * b

square(3) # Call 1 square(4) # Call 2 print(square.calls) # 2 import time def add(a, b): return a + b add

say = greet # assign function to variable print(say("Alice")) # Hello, Alice def outer(msg): def inner(): # closure captures 'msg' print(msg) return inner

def debug(func): @wraps(func) # preserves , doc , etc. def wrapper(*args, **kwargs): print(f"{func. name }: args={args}, kwargs={kwargs}") return func(*args, **kwargs) return wrapper 5)) @logger def multiply(a

# DEEP DIVE: Python Decorators (Intermediate to Advanced) def greet(name): return f"Hello, {name}"