code: def h2o_H2OFrame_ascharacter():
      """
      Python API test: h2o.frame.H2OFrame.ascharacter()
  
      Copied from pyunit_ascharacter.py
      """
      h2oframe = h2o.import_file(
          path=pyunit_utils.locate("smalldata/junit/cars.csv")
      )
      newFrame = h2oframe["cylinders"].ascharacter()
  
      assert_is_type(newFrame, H2OFrame)
      assert newFrame.isstring()[
          0
      ], "h2o.H2OFrame.ascharacter() command is not working."
  
imports: import sys
  import h2o
  from tests import pyunit_utils
  from h2o.utils.typechecks import assert_is_type
  from h2o.frame import H2OFrame
label_desc: Use image node_id 1 for calling a global function with example usage: h2o_H2OFrame_ascharacter() without return types