[test 1] >>> class A: ... i = 1 ... >>> a = A() >>> A.i 1 >>> a.i 1 >>> A.i = 2 >>> A.i 2 >>> a.i 2 >>> [test2] >>> class A: ... i = 1 ... >>> a = A() >>> A.i 1 >>> a.i 1 >>> a.i = 2 >>> A.i 1 >>> a.i 2 >>> Is there somthing wrong????