code: def h2o_H2OFrame_gsub():
      """
      Python API test: h2o.frame.H2OFrame.gsub(pattern, replacement, ignore_case=False)
  
      Copied from pyunit_sub_gsub.py
      """
      frame = h2o.import_file(
          path=pyunit_utils.locate("smalldata/iris/iris.csv"),
          col_types=[
              "numeric",
              "numeric",
              "numeric",
              "numeric",
              "string",
          ],
      )
  
      frame["C5"] = frame["C5"].gsub("s", "z", ignore_case=False)
      assert (
          frame[0, 4] == "Iriz-zetoza"
      ), "Expected 'Iriz-zetoza', but got {0}".format(frame[0, 4])
  
label_desc: Use image node_id 1 for calling a global function with example usage: h2o_H2OFrame_gsub() without return types