What are some advanced examples of decorators in Python?

What are some advanced examples of decorators in Python?

Advanced decorators in Python can include class decorators, decorators with arguments, and even decorators that modify methods.

Can you show me an example of a decorator with arguments?

Sure! Here's a simple example:

def repeat(num_times):
    def decorator_repeat(func):
        def wrapper(*args, **kwargs):
            for _ in range(num_times):
                func(*args, **kwargs)
        return wrapper
    return decorator_repeat

@repeat(3)
def greet(name):
    print(f'Hello, {name}!')

# This will print 'Hello, John!' three times.
greet('John')

What about class decorators? How do they work?

Class decorators are similar to function decorators but are applied to classes. They can modify or enhance class behavior. Here's an example:

def add_str_method(cls):
    cls.__str__ = lambda self: f'Instance of {self.__class__.__name__}'
    return cls

@add_str_method
class MyClass:
    pass

obj = MyClass()
print(obj)  # Output: Instance of MyClass