code: def testForLoopWithStep(self):
      step = control.Do("count", self.cnt_net_)
      self.ForLoopTest(step)
      self.ForLoopTest([step, self.idle_net_])
  
imports: from caffe2.python import control, core, test_util, workspace
  import logging
label_desc: Use image node_id 7 for calling the TestControl obj's underlying member method code with example usage: obj.testForLoopWithStep() without return types