code: def as_proj4(self):
          
          url = '{prefix}{code}.proj4?download'.format(prefix=EPSG_IO_URL,
                                                       code=self.id)
          return requests.get(url).text.strip()
docs: Return the PROJ.4 string which corresponds to the CRS.
  
          For example::
  
              >>> print(get(21781).as_proj4())
              +proj=somerc +lat_0=46.95240555555556 +lon_0=7.439583333333333 \
  +k_0=1 +x_0=600000 +y_0=200000 +ellps=bessel \
  +towgs84=674.4,15.1,405.3,0,0,0,0 +units=m +no_defs