Expert Python Programming - Third Edition

Parametrizing decorators

In real usage scenarios, there is often a need to use decorators that can be parameterized. When the function is used as a decorator, then the solution is simple – a second level of wrapping has to be used. Here is a simple example of the decorator that repeats the execution of a decorated function the specified number of times every time it is called:

def repeat(number=3): 
    """Cause decorated function to be repeated a number of times. 
     
    Last value of original function call is returned as a result.
     :param number: number of repetitions, 3 if not specified """ def actual_decorator(function): def wrapper(*args, **kwargs): result = None for _ in range(number): result = function(*args, **kwargs) return result return wrapper ...