[英]How can I send unknown list of arguments to a python decorator — when the decorator is a method of a different class?
This question is related to another question I just asked. 这个问题与我刚才问的另一个问题有关。
I have created a python decorator as shown below. 我创建了一个python装饰器,如下所示。 I want this decorator to accept an unknown list of arguments. 我希望这个装饰器接受未知的参数列表。 But there is an added wrinkle. 但是还会有皱纹。 The decorator is an instance method of another class: 装饰器是另一个类的实例方法:
#!/usr/bin/env python
from functools import wraps
class A:
def my_decorator(self, func=None, **kwargs):
def inner_function(decorated_function):
def wrapped_func(*fargs, **fkwargs):
print kwargs
return decorated_function(*fargs, **fkwargs)
return wrapped_func
if func:
return inner_function(func)
else:
return inner_function
class B:
my_a = A()
@my_a.my_decorator(arg_1="Yolo", arg2="Bolo")
def my_func():
print "Woo Hoo!"
my_B = B()
B.my_func()
But this code below doesn't work: 但是下面的代码不起作用:
Traceback (most recent call last):
File "./decorator_test.py", line 30, in <module>
B.my_func()
TypeError: unbound method wrapped_func() must be called with B instance as first argument (got nothing instead)
How to fix it? 如何解决?
Here's my approach to coding your decorator: 这是编码装饰器的方法:
class A:
def __init__(self, func=None, **kargs):
self.args = func
self.kargs = kargs
def __call__(self, decorated_function):
def wrapper_func(*args, **kargs):
print kargs
return decorated_function(*args, **kwargs)
if self.func:
#..do something..
return wrapper_func
elif 'xyz' in self.kargs:
#...do something else here..
return wrapper_func
else:
...
class B:
@A(arg_1="Yolo", arg2="Bolo") # A(...)(my_func)
def my_func():
print "Woo Hoo!"
This is a typical way of coding decorators. 这是编码装饰器的典型方法。 Class A
returns a callable object when called. 类A
在被调用时返回可调用对象。 The callable object of class A
will be called automatically for decoration. A
类的可调用对象将被自动调用以进行装饰。 When the callable object is called, its __call__
method gets triggered and its __call__
operator overloading method returns the wrapper function after performing some customization. 调用可调用对象时,将触发其__call__
方法,并且其__call__
运算符重载方法在执行某些自定义后将返回包装函数。 The wrapper function is the function that wraps logic around your original function. 包装函数是将逻辑包装在原始函数周围的函数。
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