patching example

gistfile1.py

class Tester():                                                                                                                                                           
    def a(self):                                                                                                                                                          
        print 'a'                                                                                                                                                         
                                                                                                                                                                          
    def b(self):                                                                                                                                                          
        print 'b'                                                                                                                                                         
                                                                                                                                                                          
>>> x=Tester()                                                                                                                                                            
                                                                                                                                                                          
>>> y=Tester()                                                                                                                                                            
                                                                                                                                                                          
>>> x.a()                                                                                                                                                                 
a                                                                                                                                                                         
>>> x.b()                                                                                                                                                                 
b                                                                                                                                                                         
>>> x.a=x.b                                                                                                                                                               
                                                                                                                                                                          
>>> x.a()                                                                                                                                                                 
b                                                                                                                                                                         
>>> x.b()                                                                                                                                                                 
b                                                                                                                                                                         
>>> y.a()                                                                                                                                                                 
a                                                                                                                                                                         
>>> y.b()                                                                                                                                                                 
b