code: def space_headers():
      f = h2o.import_file(
          path=pyunit_utils.locate("smalldata/jira/citibike_head.csv")
      )
  
      print(f.names)
  
      f["starttime"].show()
  
      h2o_median = f["start station id"].median()
  
      assert (
          h2o_median[0] == 444
      ), 'Expected median for "start station id" to be 444, but got {0}'.format(
          h2o_median
      )
  
label_desc: Use image node_id 1 for calling a global function with example usage: space_headers() without return types