timmy <"timothy at open-networks.net"> wrote: > i make a copy of a list, and delete an item from it and it deletes it > from the orginal as well, what the hell is going on?!?!?! > > #create the staff copy of the roster > Roster2 = [] > for ShiftLine in Roster: > #delete phone number from staff copy > Roster2.append(ShiftLine) > del Roster2[len(Roster2)-1][1] > > Roster2 should have nothing to do with Roster, right??? doing a print of > both lists confirms that the phone number has been removed from both
You seem to have a list of lists and are making a new outer list. The lists inside that outer list are not copied. You can copy them by calling list(item) or copy.copy(item): >>> roster = [ ... ["Tim", "12345", "some more"], ... ["Jack", "54321", "whatever"], ... ] >>> roster2 = [] >>> for item in roster: ... item = list(item) ... del item[1] ... roster2.append(item) ... >>> roster [['Tim', '12345', 'some more'], ['Jack', '54321', 'whatever']] >>> roster2 [['Tim', 'some more'], ['Jack', 'whatever']] Peter -- http://mail.python.org/mailman/listinfo/python-list
