print dir(type) #__mro__ attribute is in here
print dir(object) #no __mro__ attribute
class Mammals(object):
pass
class Dog(Mammals):
pass
print issubclass(Dog, type) #False
print Dog.__mro__
--output:--
(<class '__main__.Dog'>, <class '__main__.Mammals'>, <type 'object'>)
The output suggests that Dog actually is a subclass of type--despite
the fact that issubclass(Dog, type) returns False. In addition, the
output of dir(type) and dir(object):
['__base__', '__bases__', '__basicsize__', '__call__', '__class__',
'__cmp__', '__delattr__', '__dict__', '__dictoffset__', '__doc__',
'__flags__', '__getattribute__', '__hash__', '__init__',
'__itemsize__', '__module__', '__mro__', '__name__', '__new__',
'__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__str__',
'__subclasses__', '__weakrefoffset__', 'mro']
['__class__', '__delattr__', '__doc__', '__getattribute__',
'__hash__', '__init__', '__new__', '__reduce__', '__reduce_ex__',
'__repr__', '__setattr__', '__str__']
suggests that type inherits from object since type has all the same
attributes as object plus some additional ones. That seems to
indicate a hierarchy like this:
object
|
V
type
|
V
Mammals
|
V
Dog
But then why does issubclass(Dog, type) return False?
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