6.6. Decorator About Arguments

Without Arguments
With Positional Arguments
With Mixed Arguments
With Keyword Arguments

In Python, decorators can also take arguments. This allows you to customize the behavior of the decorator for different use cases.

To create a decorator with arguments, you need to define a function that takes the arguments you want to use, and then returns a decorator function that takes the original function as its argument. The decorator function can then use the arguments passed to the outer function to modify the behavior of the original function.

Here is an example of a decorator with arguments:

>>> def repeat(num_repeats):
...     def decorator(func):
...         def wrapper(*args, **kwargs):
...             for i in range(num_repeats):
...                 func(*args, **kwargs)
...         return wrapper
...     return decorator
>>>
>>> @repeat(num_repeats=3)
... def say_hello(name):
...     print(f'Hello {name}')
>>>
>>> say_hello('Mark')
Hello Mark
Hello Mark
Hello Mark

In this example, the repeat function takes an argument num_repeats and returns a decorator function. The decorator function takes the original function func as its argument and returns a new function wrapper that calls the original function multiple times based on the value of num_repeats.

The @repeat(num_repeats=3) syntax is used to apply the decorator to the say_hello function with the argument num_repeats set to 3. When say_hello is called with the argument "Mark", it will print "Hello Mark" three times.

6.6.1. Without Arguments

>>> @mydecorator  
... def myfunction(*args, **kwargs):
...     ...

6.6.2. With Positional Arguments

>>> @mydecorator('Mark', 'Watney')  
... def myfunction(*args, **kwargs):
...     ...

6.6.3. With Mixed Arguments

>>> @mydecorator('Mark', lastname='Watney')  
... def myfunction(*args, **kwargs):
...     ...

6.6.4. With Keyword Arguments

>>> @mydecorator(firstname='Mark', lastname='Watney')  
... def myfunction(*args, **kwargs):
...     ...