old_contents: def getKeys():
  	return ['port', 'u', 'd', 'transfer_enable', 'passwd', 'enable' ]
  
  def isTurnOn(row):
  	return True
  
  
new_contents: def getKeys():
  	return ['port', 'u', 'd', 'transfer_enable', 'passwd', 'enable' ]
  	#return ['port', 'u', 'd', 'transfer_enable', 'passwd', 'enable', 'plan' ] # append the column name 'plan'
  
  def isTurnOn(row):
  	return True
  	#return row['plan'] == 'B' # then judge here
  
  
subject: add demo code in switchrule.py