code: def polygonize(self, width, cap_style_line=CAP_STYLE.flat, cap_style_point=CAP_STYLE.round):
          
          shape = self._shape
          if isinstance(shape, (LineString, MultiLineString)):
              return self.__class__(
                  shape.buffer(width / 2, cap_style=cap_style_line),
                  self.crs
              )
          elif isinstance(shape, (Point, MultiPoint)):
              return self.__class__(
                  shape.buffer(width / 2, cap_style=cap_style_point),
                  self.crs
              )
          else:
              return self
docs: Turns line or point into a buffered polygon.