code: def check_ps():    
      
      if int(input_pwr_sply) != 0:        
          ps_data = walk_data(sess, oid_ps, helper)[0]
          ps_ok_count = 0
          
          for x, state in enumerate(ps_data, 1):
              # human readable status
              hr_status = normal_state[int(state)]
              if  hr_status != "ok":
                  # if the power supply is ok, we will set a critical status and add it to the summary
                  helper.add_summary('Power supply status %s: %s' % (x, hr_status))
                  helper.status(critical)
              else:
                  # if everything is ok, we increase the ps_ok_count
                  ps_ok_count += 1
              
              # we always want to see the status in the long output
              helper.add_long_output('Power supply status %s: %s' % (x, hr_status))
          helper.add_long_output('')
  
          if int(input_pwr_sply) != ps_ok_count:
              # if the confiugred power supplies and power supplies in ok state are different
              helper.add_summary('%s power supplies expected - %s power supplies ok ' % (input_pwr_sply, ps_ok_count))
              helper.status(critical)
docs: Check if the power supplies are ok, and we have the configured amount
      The check is skipped if --ps=0