code: def view_or_add(self, title):
          '''
          To judge if there is a post of the title.
          Then, to show, or to add.
          '''
          postinfo = MWiki.get_by_wiki(title)
          if postinfo:
              if postinfo.kind == self.kind:
                  self.view(postinfo)
              else:
                  return False
          else:
              self.to_add(titlef view_or_add(self, title):
          '''
          To judge if there is a post of the title.
          Then, to show, or to add.
          '''
          postinfo = MWiki.get_by_wiki(title)
          if postinfo:
              if postinfo.kind == self.kind:
                  self.view(postinfo)
              else:
                  return False
          else:
              self.to_add(title)
docs: To judge if there is a post of the title.
          Then, to show, or to add.