Hello, You're right about it but this is a simple code which tells my problem. I need actually the frame itself for states and unfortunately copy.copy(frame) throws an exception. Pickling also doesn't work. Do you have any other idea?
Thanks, Gokce. Pierre Quentel schrieb: > This is because in "states" you store a reference to frame.f_locals, > not the value it takes. When you print states, all the items are the > same reference to the same object and have the same value > > If you want to store the values at each cycle you should store a copy > of frame.f_locals, which will give you a different object > > After import sys add the line : > import copy > > and instead of > states.append(frame.f_locals) > write > states.append(copy.copy(frame.f_locals)) > > > Another example of this side-effect of storing references and not > values : > > Python 2.4.2 (#67, Sep 28 2005, 12:41:11) [MSC v.1310 32 bit (Intel)] > on win32 > Type "help", "copyright", "credits" or "license" for more information. > >>> states = [] > >>> x = [0] > >>> for i in range(10): > ... x[0] = i > ... states.append(x) > ... > >>> print states > [[9], [9], [9], [9], [9], [9], [9], [9], [9], [9]] > >>> > > Pierre -- http://mail.python.org/mailman/listinfo/python-list
