class Program():
??? def __new__(cls,*args,**kwargs):
??????? print "call_new_method"
??????? print args
??????? return super(Program.cls).__new__(cls,*args,**kwargs)
??? def __init__(self,name,age):
??????? print "call_init_method"
??????? self.name=name
??????? self.age=age
??? def __eq__(self,other):
??????? if isinstance(other,Program):
??????????? if self.age==other.age:
??????????????? return True
??????????? else:
??????????????? return False
??????? else:
??????????? raise Exception("The type of object must be Program")
??? def __add__(self,other):
??????? if isinstance(other,Program):
??????????? return self.age+other.age
??????? else:
??????????? raise Exception("The type of object must be Program")
? ?
p1=Program("Thom",63)
p2=Program("Tom",60)
print p1==p2
print p1+p2

代碼運行結果為：call_init_method
call_init_method
False
123

為什么覺得__new__方法沒有執行 ？

后添加繼承object，運行結果為？

call_new_method
('Thom', 63)
Traceback (most recent call last):
? File "D:\Java\myeclipse\workspace\IPython\com\Test\test_operation.py", line 24, in <module>
??? p1=Program("Thom",63)
? File "D:\Java\myeclipse\workspace\IPython\com\Test\test_operation.py", line 5, in __new__
??? return super(Program.cls).__new__(cls,*args,**kwargs)
AttributeError: type object 'Program' has no attribute 'cls'

并請問cls，self區別