code: def span(self):
          
          other = VersionRange(None)
          bound = _Bound(self.bounds[0].lower, self.bounds[-1].upper)
          other.bounds = [bound]
          return other
docs: Return a contiguous range that is a superset of this range.
  
          Returns:
              A VersionRange object representing the span of this range. For
              example, the span of "2+<4|6+<8" would be "2+<8".