Edit Question - KnowledgeHub

Title Body

I am getting new_tag from a form text field with self.response.get("new_tag") and selected_tags from checkbox fields with self.response.get_all("selected_tags") I combine them like this: tag_string = new_tag new_tag_list = f1.striplist(tag_string.split(",") + selected_tags) ( f1.striplist is a function that strips white spaces inside the strings in the list.) But in the case that tag_list is empty (no new tags are entered) but there are some selected_tags , new_tag_list contains an empty string " " . For example, from logging.info : new_tag selected_tags[u'Hello', u'Cool', u'Glam'] new_tag_list[u'', u'Hello', u'Cool', u'Glam'] How do I get rid of the empty string? If there is an empty string in the list: >>> s = [u'', u'Hello', u'Cool', u'Glam'] >>> i = s.index("") >>> del s[i] >>> s [u'Hello', u'Cool', u'Glam'] But if there is no empty string: >>> s = [u'Hello', u'Cool', u'Glam'] >>> if s.index(""): i = s.index("") del s[i] else: print "new_tag_list has no empty string" But this gives: Traceback (most recent call last): File "<pyshell#30>", line 1, in <module> if new_tag_list.index(""): ValueError: list.index(x): x not in list Why does this happen, and how do I work around it?

Tags (comma-separated) Cancel