Python中装饰器的常见问题及解决方案

def decorator(func):
    def inner_function():
        print("Before function")
        func()
        print("After function")
    return inner_function

@decorator
def hello():
    print("Hello, World!")

hello()

Before function
Hello, World!
After function

def decorator_with_args(arg1, arg2):
    def decorator(func):
        def inner_function(*args, **kwargs):
            print(f"Decorator arg1={arg1}, arg2={arg2}")
            func(*args, **kwargs)
        return inner_function
    return decorator

@decorator_with_args("Hello", 42)
def hello(name):
    print(f"Hello, {name}!")

hello("World")

Decorator arg1=Hello, arg2=42
Hello, World!

import functools

def decorator(func):
    @functools.wraps(func)
    def inner_function(*args, **kwargs):
        print("Before function")
        func(*args, **kwargs)
        print("After function")
    return inner_function

@decorator
def hello():
    """This is the Hello function."""
    print("Hello, World!")

print(hello.__name__)
print(hello.__doc__)

hello
This is the Hello function.

def decorator(cls):
    class NewClass(cls):
        def decorated_method(self):
            print("Decorated method")
            super().decorated_method()

    return NewClass

@decorator
class MyClass:
    def decorated_method(self):
        print("Original method")

obj = MyClass()
obj.decorated_method()

Decorated method
Original method