python中__init__和__new__的比较

# __init__ 、 __new__
class Student(object):
 
    def __init__(self, name, age):
        print('__init__() called')
        self.name = name
        self.age = age
 
    def __new__(cls, *args, **kwargs):
        print('__new__() called')
        print(cls, args, kwargs)
        return super().__new__(cls)
  
 
# ipython 测验
In [26]: s1 = Student('hui', age=21)
__new__() called
<class '__main__.Student'> ('hui',) {'age': 21}
__init__() called
 
In [27]: s2 = Student('jack', age=20)
__new__() called
<class '__main__.Student'> ('jack',) {'age': 20}
__init__() called