Python利用new創建一個類的對象

class MyClass(BaseClass):
    def __new__(cls, *args, **kwargs):
        return super(MyClass, cls).__new__(cls, *args, **kwargs)

super並不是一個函數，而是一個類名，形如super(B, cls)事實上調用了super類的初始化函數，產生了一個super對象。Python Manuals上介紹：
super(type[, object-or-type])
Return a proxy object that delegates method calls to a parent or sibling class of type.
Note: super() only works for new-style classes.

super接收兩個參數，兩個參數的類型之間需要有繼承關系，否則會報：
TypeError: super(type, obj): obj must be an instance or subtype of type  

T.__new__(S, ...) return a new object with type S, a subtype of T