foo.py

INC = 'hoho'                                                                                                                                                  
                                                                                                                                                              
class Foo(object):                                                                                                                                            
    def __init__(self):                                                                                                                                       
        self._mock = INC                                                                                                                                  
                                                                                                                                                              
    def __del__(self):                                                                                                                                        
        print self                                                                                                                                            
        if self._mock == INC:                                                                                                                            
            print 'got hoho', self._mock, INC                                                                                                            
        else:                                                                                                                                                 
            print 'no hoho' 

main.py

import time                                                                                                                                                   
from foo import Foo                                                                                                                                           
                                                                                                                                                              
if __name__ == '__main__':                                                                                                                                    
    while True:                                                                                                                                                 
        f = Foo()                                                                                                                                             
        time.sleep(1000)