old_contents: # coding=utf-8
  import datetime
  
  __author__ = 'TIF'
  
  
  def tick():
      print('Tick! The time is: %s' % datetime.now())
new_contents: # coding=utf-8
  import datetime
  
  __author__ = 'TIF'
  
  
  
  
  
  
  def tick():
      print('Tick! The time is: %s' % datetime.now())
subject: add some changes