导入文件但报告错误NameError：未定义名称'something'

testa.py

class A:

    s1 = 333
    __age = 0

    def __init__(self,age ):
        self.__age=age
        return

    def __del__(self):  

        return  
    #private
    def __doSomething(self, s): 
        print self.__age 
        return            
    #public
    def doSomething(self, s):  
        self.__doSomething(s)    
        print s
class A:

    s1 = 333
    __age = 0