def — Advanced Playground

Defines a new function or method

Python Playground

import functools

def timer(func):
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        import time
        start = time.perf_counter()
        result = func(*args, **kwargs)
        elapsed = time.perf_counter() - start
        print(f"{func.__name__} took {elapsed:.6f}s")
        return result
    return wrapper

@timer
def slow_sum(n):
    """Sum numbers from 0 to n."""
    return sum(range(n))

result = slow_sum(1_000_000)
print(f"Result: {result}")
print(f"Docstring preserved: {slow_sum.__doc__}")

Output

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Decorators use @syntax to wrap functions. functools.wraps preserves the original function's name and docstring on the wrapper.

Challenge

Try modifying the code above to explore different behaviors. Can you extend the example to handle a new use case?

View all Advanced examples for def