code: def extract(what, calc_id, webapi=True):
      
      with performance.Monitor('extract', measuremem=True) as mon:
          if webapi:
              obj = WebExtractor(calc_id).get(what)
          else:
              obj = Extractor(calc_id).get(what)
          fname = '%s_%d.hdf5' % (what.replace('/', '-').replace('?', '-'),
                                  calc_id)
          obj.save(fname)
          print('Saved', fname)
      if mon.duration > 1:
          print(mon)
docs: Extract an output from the datastore and save it into an .hdf5 file.
      By default uses the WebAPI, otherwise the extraction is done locally.