python 为什么@decorator 不能装饰静态方法或类方法？
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Why can @decorator not decorate a staticmethod or a classmethod?
提问by user238424
Why can decoratornot decorate a staticmethod or a classmethod?
为什么decorator不能装饰静态方法或类方法？
from decorator import decorator
@decorator
def print_function_name(function, *args):
print '%s was called.' % function.func_name
return function(*args)
class My_class(object):
@print_function_name
@classmethod
def get_dir(cls):
return dir(cls)
@print_function_name
@staticmethod
def get_a():
return 'a'
Both get_dirand get_aresult in AttributeError: <'classmethod' or 'staticmethod'>, object has no attribute '__name__'.
双方get_dir并get_a导致AttributeError: <'classmethod' or 'staticmethod'>, object has no attribute '__name__'。
Why does decoratorrely on the attribute __name__instead of the attribute func_name? (Afaik all functions, including classmethods and staticmethods, have the func_nameattribute.)
为什么decorator依赖属性__name__而不是属性func_name？（Afaik 所有函数，包括 classmethods 和 staticmethods，都具有该func_name属性。）
Edit: I'm using Python 2.6.
编辑：我使用的是 Python 2.6。
采纳答案by user238424
It works when @classmethodand @staticmethodare the top-most decorators:
当@classmethod并且@staticmethod是最顶级的装饰器时，它可以工作：
from decorator import decorator
@decorator
def print_function_name(function, *args):
print '%s was called.' % function.func_name
return function(*args)
class My_class(object):
@classmethod
@print_function_name
def get_dir(cls):
return dir(cls)
@staticmethod
@print_function_name
def get_a():
return 'a'
回答by wberry
classmethodand staticmethodreturn descriptor objects, not functions. Most decorators are not designed to accept descriptors.
classmethod并staticmethod返回描述符对象，而不是函数。大多数装饰器并非设计为接受描述符。
Normally, then, you must apply classmethodand staticmethodlast when using multiple decorators. And since decorators are applied in "bottom up" order, classmethodand staticmethodnormally should be top-most in your source.
通常，当使用多个装饰器时，您必须 applyclassmethod和staticmethodlast。并且由于装饰器以“自下而上”的顺序应用，classmethod并且staticmethod通常应该在您的源代码中最顶层。
Like this:
像这样：
class My_class(object):
@classmethod
@print_function_name
def get_dir(cls):
return dir(cls)
@staticmethod
@print_function_name
def get_a():
return 'a'
回答by mykhal
Is this what you wanted?
这是你想要的吗？
def print_function_name(function):
def wrapper(*args):
print('%s was called.' % function.__name__)
return function(*args)
return wrapper
class My_class(object):
@classmethod
@print_function_name
def get_dir(cls):
return dir(cls)
@staticmethod
@print_function_name
def get_a():
return 'a'
