code: def h2o_H2OFrame_nchar():
      """
      Python API test: h2o.frame.H2OFrame.nchar()
      """
      iris = h2o.import_file(
          path=pyunit_utils.locate(
              "smalldata/iris/iris_wheader_NA_2.csv"
          )
      )
      newframe = iris[4].nchar()
      assert_is_type(newframe, H2OFrame)
      assert (
          abs(newframe.sum().flatten() - (11 + 14 + 15) * 50) < 1e-6
      ), "h2o.H2OFrame.nchar() 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_nchar() without return types