greenwich/srs.py
def srid(self):
        """Returns the EPSG ID as int if it exists."""
        epsg_id = (self.GetAuthorityCode('PROJCS') or
                   self.GetAuthorityCode('GEOGCS'))
        try:
            return int(epsg_id)
        except TypeError:
            return
def srid(self):
        """Returns the EPSG ID as int if it exists."""
        epsg_id = (self.GetAuthorityCode('PROJCS') or
                   self.GetAuthorityCode('GEOGCS'))
        try:
            return int(epsg_id)
        except TypeError:
            return
Returns the EPSG ID as int if it exists.