Python2 and Python3: __init__ and __new__

问题

I have read other questions which explain the difference between __init__ and __new__ but I just do not understand why in the following code with python 2 out:

init

and Python3:

new
init

The sample code:

class ExampleClass():
    def __new__(cls):
        print ("new")
        return super().__new__(cls)

    def __init__(self):
        print ("init")

example = ExampleClass()

回答1:

To use __new__ in Python 2.x, the class should be new-style class (class derived from object).

And call to super() is different from that of Python 3.x.

class ExampleClass(object):  # <---
    def __new__(cls):
        print("new")
        return super(ExampleClass, cls).__new__(cls)  # <---

    def __init__(self):
        print("init")

来源：https://stackoverflow.com/questions/31772535/python2-and-python3-init-and-new