Python Object-oriented--super (Python 2.x vs Python 3.x) __python

Note whether the current Python version is 2.X or 3.x,python 3.X has a greater change in the use of super than Python 2.X; 1. Python 2.x

Class Contact (object):
    all_contacts = []
    def __init__ (self, Name, email):
        self.name = name
        Self.email = Email
        Contact.all_contacts.append (self)

class Friend:
    def __init__ (self, name, email, phone):
        Super (Friend, self). __init__ (name, email)
        Self.phone = Phone

In the Python 2.x environment, for a parent class that needs to be inherited, you need to explicitly inherit the parent class from the object class, otherwise use super (subclass, Self) in the subclass. __INIT__ () will be reported Typeerror:must is type, not classobj.

This is because of the Python 2.x:

>> Class A ():
       pass
>> type (a)
classobj

>> Class A (object):
Pass >> type (A)
type

and Python 2.x does not treat classobj as type.

Of course, it is also possible to use such a statement in a subclass:

Class Friend:
    def __init__ (self, name, email, phone):
        contact.__init__ (self, name, email, phone)
        Self.phone = Phone

Python super () usage encounters typeerror:must be type, not classobj 2. Python 3.x

Class Contact:
    all_contacts = []
    def __init__ (self, Name, email):
        self.name = name
        Self.email = Email
  contact.all_contacts.append (self)

class Friend (Contact):
    def __init__ (self, name, email, phone):
        Super (). __init__ (name, email)
        Self.phone = Phone