python - Subclass-safe class variable -

python - Subclass-safe class variable -

i can do:

class t(object): = 5 # utilize value somewhere in function def p(self): print id(i), t.i

.. but, if happen subclass t ..

class n(t): pass

.. n.i in fact t.i. found way deal this:

class t(object): = 5 def p(self): print self.__class__.i

.. right , sure work? or can produce unexpected behavior in situations (which unaware of)?

self.__class__.i right , sure work (although i poor naming choice).

if method access i not utilize self, can create class method, in case first parameter class , not instance:

class t(object): = 5 @classmethod def p(cls): print cls.i

to read attribute, can utilize self.i safely too. alter value, using self.i = value alter attribute of instance, masking class attribute instance.

python