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Are staticmethod and classmethod in python not callable? [duplicate]

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2

This question already has an answer here:

• 
  Why are python static/class method not callable?
  
  1 answer
  
  

I was writing a metaclass to force docstring for class and instance method. Well to my surprise staticmethod and classmethod are not callable just like instance method. I am not sure why?

class MyMeta(type):
 def __new__(cls, name, parents, attrs):
 print(cls, name, parents, attrs)

 if "__doc__" not in attrs:
 raise TypeError("Please define class level doc string!!!")

 for key, value in attrs.items():
 if callable(value) and value.__doc__ is None:
 raise TypeError("Please define def level doc string!!!")

 return super().__new__(cls, name, parents, attrs)

class A(metaclass=MyMeta):
 """This is API doc string"""
 def hello(self):
 """"""
 pass

 def __init__(self):
 """__init__ Method"""
 pass

 @classmethod
 def abc(cls):
 pass

I am not able to understand why are they not callable? They seems to pass my check if I don't define docstring for them.

python python-3.x metaclass

share|improve this question

edited Mar 23 at 18:36

Aran-Fey

20.8k54180

asked Mar 23 at 18:33

PravinPravin

1621319

marked as duplicate by Aran-Fey, Community♦ Mar 23 at 18:48

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

add a comment | 

2

This question already has an answer here:

• 
  Why are python static/class method not callable?
  
  1 answer
  
  

I was writing a metaclass to force docstring for class and instance method. Well to my surprise staticmethod and classmethod are not callable just like instance method. I am not sure why?

class MyMeta(type):
 def __new__(cls, name, parents, attrs):
 print(cls, name, parents, attrs)

 if "__doc__" not in attrs:
 raise TypeError("Please define class level doc string!!!")

 for key, value in attrs.items():
 if callable(value) and value.__doc__ is None:
 raise TypeError("Please define def level doc string!!!")

 return super().__new__(cls, name, parents, attrs)

class A(metaclass=MyMeta):
 """This is API doc string"""
 def hello(self):
 """"""
 pass

 def __init__(self):
 """__init__ Method"""
 pass

 @classmethod
 def abc(cls):
 pass

I am not able to understand why are they not callable? They seems to pass my check if I don't define docstring for them.

python python-3.x metaclass

share|improve this question

edited Mar 23 at 18:36

Aran-Fey

20.8k54180

asked Mar 23 at 18:33

PravinPravin

1621319

marked as duplicate by Aran-Fey, Community♦ Mar 23 at 18:48

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

add a comment | 

This question already has an answer here:

• 
  Why are python static/class method not callable?
  
  1 answer
  
  

I was writing a metaclass to force docstring for class and instance method. Well to my surprise staticmethod and classmethod are not callable just like instance method. I am not sure why?

class MyMeta(type):
 def __new__(cls, name, parents, attrs):
 print(cls, name, parents, attrs)

 if "__doc__" not in attrs:
 raise TypeError("Please define class level doc string!!!")

 for key, value in attrs.items():
 if callable(value) and value.__doc__ is None:
 raise TypeError("Please define def level doc string!!!")

 return super().__new__(cls, name, parents, attrs)

class A(metaclass=MyMeta):
 """This is API doc string"""
 def hello(self):
 """"""
 pass

 def __init__(self):
 """__init__ Method"""
 pass

 @classmethod
 def abc(cls):
 pass

I am not able to understand why are they not callable? They seems to pass my check if I don't define docstring for them.

python python-3.x metaclass

share|improve this question

edited Mar 23 at 18:36

Aran-Fey

20.8k54180

asked Mar 23 at 18:33

PravinPravin

1621319

class MyMeta(type):
 def __new__(cls, name, parents, attrs):
 print(cls, name, parents, attrs)

 if "__doc__" not in attrs:
 raise TypeError("Please define class level doc string!!!")

 for key, value in attrs.items():
 if callable(value) and value.__doc__ is None:
 raise TypeError("Please define def level doc string!!!")

 return super().__new__(cls, name, parents, attrs)

class A(metaclass=MyMeta):
 """This is API doc string"""
 def hello(self):
 """"""
 pass

 def __init__(self):
 """__init__ Method"""
 pass

 @classmethod
 def abc(cls):
 pass

share|improve this question

edited Mar 23 at 18:36

Aran-Fey

20.8k54180

asked Mar 23 at 18:33

PravinPravin

1621319

share|improve this question

edited Mar 23 at 18:36

Aran-Fey

20.8k54180

asked Mar 23 at 18:33

PravinPravin

1621319

edited Mar 23 at 18:36

Aran-Fey

20.8k54180

edited Mar 23 at 18:36

Aran-Fey

20.8k54180

asked Mar 23 at 18:33

PravinPravin

1621319

asked Mar 23 at 18:33

PravinPravin

1621319

1 Answer
1

active

oldest

votes

2

They are not callable. classmethod and staticmethod are descriptor objects, and they do not implement __call__. The HOWTO actually gives examples of how you might implement them in pure python, so for example classmethod objects:

class ClassMethod(object):
 "Emulate PyClassMethod_Type() in Objects/funcobject.c"

 def __init__(self, f):
 self.f = f

 def __get__(self, obj, klass=None):
 if klass is None:
 klass = type(obj)
 def newfunc(*args):
 return self.f(klass, *args)
 return newfunc

Note, function objects are descriptors too. They just happen to be callable descriptors.

share|improve this answer

answered Mar 23 at 18:37

juanpa.arrivillagajuanpa.arrivillaga

40k34078

add a comment | 

2

They are not callable. classmethod and staticmethod are descriptor objects, and they do not implement __call__. The HOWTO actually gives examples of how you might implement them in pure python, so for example classmethod objects:

class ClassMethod(object):
 "Emulate PyClassMethod_Type() in Objects/funcobject.c"

 def __init__(self, f):
 self.f = f

 def __get__(self, obj, klass=None):
 if klass is None:
 klass = type(obj)
 def newfunc(*args):
 return self.f(klass, *args)
 return newfunc

Note, function objects are descriptors too. They just happen to be callable descriptors.

share|improve this answer

answered Mar 23 at 18:37

juanpa.arrivillagajuanpa.arrivillaga

40k34078

add a comment | 

2

They are not callable. classmethod and staticmethod are descriptor objects, and they do not implement __call__. The HOWTO actually gives examples of how you might implement them in pure python, so for example classmethod objects:

class ClassMethod(object):
 "Emulate PyClassMethod_Type() in Objects/funcobject.c"

 def __init__(self, f):
 self.f = f

 def __get__(self, obj, klass=None):
 if klass is None:
 klass = type(obj)
 def newfunc(*args):
 return self.f(klass, *args)
 return newfunc

Note, function objects are descriptors too. They just happen to be callable descriptors.

share|improve this answer

answered Mar 23 at 18:37

juanpa.arrivillagajuanpa.arrivillaga

40k34078

add a comment | 

They are not callable. classmethod and staticmethod are descriptor objects, and they do not implement __call__. The HOWTO actually gives examples of how you might implement them in pure python, so for example classmethod objects:

class ClassMethod(object):
 "Emulate PyClassMethod_Type() in Objects/funcobject.c"

 def __init__(self, f):
 self.f = f

 def __get__(self, obj, klass=None):
 if klass is None:
 klass = type(obj)
 def newfunc(*args):
 return self.f(klass, *args)
 return newfunc

Note, function objects are descriptors too. They just happen to be callable descriptors.

share|improve this answer

answered Mar 23 at 18:37

juanpa.arrivillagajuanpa.arrivillaga

40k34078

class ClassMethod(object):
 "Emulate PyClassMethod_Type() in Objects/funcobject.c"

 def __init__(self, f):
 self.f = f

 def __get__(self, obj, klass=None):
 if klass is None:
 klass = type(obj)
 def newfunc(*args):
 return self.f(klass, *args)
 return newfunc

share|improve this answer

answered Mar 23 at 18:37

juanpa.arrivillagajuanpa.arrivillaga

40k34078

answered Mar 23 at 18:37

juanpa.arrivillagajuanpa.arrivillaga

40k34078

answered Mar 23 at 18:37

juanpa.arrivillagajuanpa.arrivillaga

40k34078