Mark Dickinson <dicki...@gmail.com> added the comment:
This isn't a bug. After this line in your code: o = x both o and x refer to the same list object. So any modification you make to that list through the name "x" (for example, x[i][n]+=y[i][n]) will be seen through the name "o" as well. There's lots written elsewhere explaining Python's assignment semantics. I highly recommend this presentation by Ned Batchelder: https://nedbatchelder.com/text/names1.html You can also ask further questions on the Python mailing list: https://mail.python.org/mailman/listinfo/python-list Closing here. ---------- nosy: +mark.dickinson resolution: -> not a bug stage: -> resolved status: open -> closed _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue39118> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
