[英]Python passing self to the decorator
I'm trying to pass the self
object to my decorator to access its contents but get the following error:我试图将self
对象传递给我的装饰器以访问其内容,但出现以下错误:
def log_decorator():
def log_real_decorator(f):
@wraps(f)
def wrapper(self,*args, **kw):
print "I am the decorator, I know that self is", self, "and I can do whatever I want with it!"
print "I also got other args:", args, kw
f(*args, **kw)
return wrapper
return log_real_decorator
class Foo(object):
@log_decorator
def meth(self):
print "I am the method, my self is", self
f = Foo()
f.meth()
Error:-错误:-
TypeError: log_decorator() takes no arguments (1 given)
This is how you do it:这是你如何做到的:
def log_real_decorator(f):
@wraps(f)
def wrapper(self, *args, **kw):
print "I am the decorator, I know that self is", self, "and I can do whatever I want with it!"
print "I also got other args:", args, kw
f(self, *args, **kw)
# ^ pass on self here
return wrapper
Simply pass on self
.简单地传递self
。
Or或者
If you want to create a generic decorator that can both be used for class and methods you can simply do this:如果你想创建一个可以同时用于类和方法的通用装饰器,你可以简单地这样做:
def log_real_decorator(f):
@wraps(f)
def wrapper(*args, **kw):
# Do something here
f(*args, **kw)
return wrapper
Also, the decorator that you have created is used when you need to pass some parameters to the decorator(like @log_real_decorator(some_param=1)
. In your case, you don't need that, instead what you should do is create a decorator with two nested functions as I have done above and call it as @log_real_decorator
.此外,当您需要将一些参数传递给装饰器时,将使用您创建的装饰器(例如@log_real_decorator(some_param=1)
。在您的情况下,您不需要它,而是您应该做的是创建一个装饰器有两个嵌套函数,就像我在上面所做的那样,并将其称为@log_real_decorator
。
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