@functools.wraps(func)\ndef wrapper(*args, **kwargs):\n wrapper.calls += 1\n return func(*args, **kwargs)

Decorators & Metaclasses

Meaning

A decorator that counts how many times a wrapped function is called while preserving the original function's metadata via functools.wraps.

Primary Function

Counts function calls and preserves the wrapped function's __name__, __doc__, and other attributes.

Communicative Purpose

To provide a reusable call‑counting decorator that maintains the wrapped function's interface for debugging, profiling, or instrumentation.

Função primária

Counts function calls and preserves the wrapped function's __name__, __doc__, and other attributes.

Propósito comunicativo

To provide a reusable call‑counting decorator that maintains the wrapped function's interface for debugging, profiling, or instrumentation.

Situações de gatilho

When you need to monitor how often a function is invoked without changing its public signature or breaking introspection tools.

Contextos

Used in debugging, performance profiling, memoization decorators, or any scenario where call frequency must be tracked while keeping the function's signature intact.

Família do chunk

Python decorators
functools.wraps
function decorators
call counting

Tag de espaçamento: Medium-termIdioma?: Sim

Examples

def count_calls(func):\n @functools.wraps(func)\n def wrapper(*args, **kwargs):\n wrapper.calls += 1\n return func(*args, **kwargs)\n wrapper.calls = 0\n return wrapper\n\n@count_calls\ndef greet(name):\n return f"Hello, {name}"\n\nprint(greet("Alice"))\nprint(greet("Bob"))\nprint(greet.calls) # 2

def count_calls(func):\n @functools.wraps(func)\n def wrapper(*args, **kwargs):\n wrapper.calls += 1\n return func(*args, **kwargs)\n wrapper.calls = 0\n return wrapper\n\nclass Counter:\n @count_calls\n def process(self, item):\n return item * 2\n\nc = Counter()\nc.process(5)\nc.process(10)\nprint(c.process.calls) # 2

def count_calls(func):\n @functools.wraps(func)\n def wrapper(*args, **kwargs):\n wrapper.calls += 1\n return func(*args, **kwargs)\n wrapper.calls = 0\n return wrapper\n\n@count_calls\ndef factorial(n):\n return 1 if n == 0 else n * factorial(n-1)\n\nprint(factorial(5))\nprint(factorial.calls) # 6