class Programmer(object):
   def __new__(cls, *args, **kwargs):
       print 'call __new__ method'
       print args
       print super(Programmer,cls).__new__(cls, *args, **kwargs)

   def __init__(self,name,age):
       print 'call __init__ method'
       self.name = name
       self.age = age

if __name__ == '__main__':
   programmer = Programmer('Albert',25)
   print programmer.__dict__

运行结果：

"C:\Program Files\Anaconda2\python.exe" C:/Users/Administrator/PycharmProjects/untitled/classlearning4-2.py

Traceback (most recent call last):

call __new__ method

('Albert', 25)

<__main__.Programmer object at 0x00000000022F2C50>

  File "C:/Users/Administrator/PycharmProjects/untitled/classlearning4-2.py", line 17, in <module>

    print programmer.__dict__

AttributeError: 'NoneType' object has no attribute '__dict__'