新式類，經典類
python3之后均稱為新式類，默認繼承object類
Python2.x版本分為：分新式類與經典類
新式類：每個類都繼承于一個基類，可以是自定義類或者其它類，默認承于object
舊式類：不繼承object類
mro算法：方法解析順序
新式類中采用廣度算法，經典類中采用深度算法
super 僅用于新式類
super 用法
In Python 3 and above, the syntax for super is:
super().methoName(args)
Whereas the normal way to call super (in older builds of Python) is:
super(subClass, instance).method(args)
單個繼承初始化
class MyParentClass(object):def __init__(self):pass
class SubClass(MyParentClass):def __init__(self):MyParentClass.__init__(self)
If we were using Python 2, we would write the subclass like this (using the super function):
class SubClass(MyParentClass):
def __init__(self):
super(SubClass, self).__init__()
The same code is slightly different when writing in Python 3, however.
class MyParentClass():def __init__(self):pass
class SubClass(MyParentClass):def __init__(self):
????super()
Now, keep in mind most classes will also have arguments passed to them. The super function will change even more when that happens.
It will look like the following:
class MyParentClass():def __init__(self, x, y):pass
class SubClass(MyParentClass):def __init__(self, x, y):super().__init__(x, y)
In Python 3 and above, the syntax for super is:
super().methoName(args)
Whereas the normal way to call super (in older builds of Python) is:
super(subClass, instance).method(args)
新式類中mro：廣度搜索
super的原理：遍歷當前類的mro列表，查找含有當前方法的第一個類，找到則用類調用方法，退出
Demo
