Question

我有一个像这样的简单装饰器。但是，当我导入python文件时，它会立即运行，我无法再次调用该函数。如何使用装饰器？

def plain_decorator(func):
    def decorated_func():
        print "Decorating"
        func()
        print "Decorated"
    return decorated_func()

@plain_decorator
def hw():
    print "Hello Decorators!"

>>> import decorator_ex2 as d
Decorating
Hello Decorators!
Decorated
>>> d.hw()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'NoneType' object is not callable
>>>

Answer 1

尝试使用它，因为你从外部（plain_decorator）函数返回时调用你的内部（decorated_func）函数

def plain_decorator(func):
    def decorated_func():
        print "Decorating"
        func()
        print "Decorated"
    return decorated_func

@plain_decorator
def hw():
    print "Hello Decorators!"

在另一个文件中导入和使用装饰器

1 个答案: