Python Day 24(双下方法 __new__ __del__ item 异常处理)
__init__ 初始化方法
__new__ 构造方法(申请内存空间)
class A: def __init__(self): print('init') def __new__(cls, *args, **kwargs): #object __new__创造对象 #py2不主动继承 print('new') self = object.__new__(cls) return self a = A() +++++++++++++++ python3: new init +++++++++++++++ python2: init