code: def trim(self, len_):
          
          other = Version(None)
          other.tokens = self.tokens[:len_]
          other.seps = self.seps[:len_ - 1]
          return other
docs: Return a copy of the version, possibly with less tokens.
  
          Args:
              len_ (int): New version length. If >= current length, an
                  unchanged copy of the version is returned.