code: def h2o_H2OFrame_difflag1():
      """
      Python API test: h2o.frame.H2OFrame.difflag1()
      """
      python_object = [list(range(10)), list(range(10))]
      foo = h2o.H2OFrame(python_obj=np.transpose(python_object))
  
      diffs = foo[0].difflag1()  # default
      results = diffs == 1.0
      # check correct return type
      assert_is_type(diffs, H2OFrame)
      assert (
          results.sum().flatten() == foo.nrow - 1
      ), "h2o.H2OFrame.difflag1() command is not working."
  
imports: import sys
  from tests import pyunit_utils
  import h2o
  import numpy
  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_difflag1() without return types