saeed added the comment: Thank for attention,but see this:
>>> x=y=[] >>> x=y=[0]*3 >>> x [0, 0, 0] >>> y [0, 0, 0] >>> y=[0, 1, 1] >>> x [0, 0, 0] >>> y [0, 1, 1] >>> y[1]+=1 >>> y [0, 2, 1] >>> x [0, 0, 0] >>> x[0]+=5 >>> x [5, 0, 0] >>> y [0, 2, 1] then must my code work and there is another problem :/ ********************************* notice: I don't write like this: >>> x=[] >>> y=x ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue28594> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com