class Simple:  
    def __init__( self ):  
        print( "constructor called, id={0}".format( id( self )))  
    def __del__( self ):  
        print( "destructor called, id={0}".format( id( self )))  
    def func( sef ):  
        print( "Simple func" )  

a = Simple()  #輸出->constructor called, id = 3211123  #調(diào)用構(gòu)造函數(shù)__init__
b = Simple()  #輸出->constructor called, id = 3211145  
a = Simple()  #輸出->constructor called, id = 32111225 
              #destructor called, id = 321112 #注意：調(diào)用析構(gòu)函數(shù)__del__,。