bruce.who.hk wrote: > I just donnot know why this is wrong
btw, you really should try to use more descriptive subject lines. for some tips, see: http://catb.org/~esr/faqs/smart-questions.html#bespecific most notably: "... imagine looking at the index of an archive of questions, with just the subject lines showing. Make your subject line reflect your question well enough that the next guy searching the archive with a question similar to yours will be able to follow the thread to an answer rather than posting the question again." </F> -- http://mail.python.org/mailman/listinfo/python-list