hi! i found a bug in python 2.7.3 if we make a list like this: a = [[0]*3]*3 then change the a[y][x] like this: a[1][1] = 1 the whole column changes. the result would be: [[0,1,0],[0,1,0],[0,1,0]] -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/docs/attachments/20130125/b5e6b7d4/attachment.html>