io.py 文件源码

def _handle_empty_point(self, geom):
        from django.contrib.gis.geos import Point
        if isinstance(geom, Point) and geom.empty:
            if self.srid:
                # PostGIS uses POINT(NaN NaN) for WKB representation of empty
                # points. Use it for EWKB as it's a PostGIS specific format.
                # https://trac.osgeo.org/postgis/ticket/3181
                geom = Point(float('NaN'), float('NaN'), srid=geom.srid)
            else:
                raise ValueError('Empty point is not representable in WKB.')
        return geom