code: def insert_missing():
      air_path = pyunit_utils.locate(
          "smalldata/airlines/allyears2k_headers.zip"
      )
  
      data = h2o.import_file(path=air_path)
  
      hour1 = old_div(data["CRSArrTime"], 100)
      mins1 = data["CRSArrTime"] % 100
      arr_time = hour1 * 60 + mins1
  
      hour2 = old_div(data["CRSDepTime"], 100)
      mins2 = data["CRSDepTime"] % 100
      dep_time = hour2 * 60 + mins2
  
      data["TravelTime"] = ((arr_time - dep_time) > 0).ifelse(
          (arr_time - dep_time), float("nan")
      )[0]
  
      data.show()
  
imports: from past.utils import old_div
  import sys
  import h2o
  from tests import pyunit_utils
label_desc: Use image node_id 1 for calling a global function with example usage: insert_missing() without return types