old_contents: import os
  import xmlrpclib
  from SimpleXMLRPCServer import SimpleXMLRPCServer
  
  def clear_buffer_cache():
  	system('free -g')
  	system('sync')
  	system("sudo sed -n 's/0/3/w /proc/sys/vm/drop_caches' /proc/sys/vm/drop_caches")
  	system('sync')
  	system("sudo sed -n 's/3/0/w /proc/sys/vm/drop_caches' /proc/sys/vm/drop_caches")
  	system('free -g')
  
  def is_even(n):
  	return n%2 == 0
  
  server = SimpleXMLRPCServer(('0.0.0.0', 8888))
  print 'Listening on port 8888...'
  server.register_function(clear_buffer_cache, 'clear_buffer_cache')
  server.register_function(is_even, 'is_even')
  server.serve_forever()
  
  
new_contents: from os import system
  import xmlrpclib
  from SimpleXMLRPCServer import SimpleXMLRPCServer
  
  def clear_buffer_cache():
  	system('free -g')
  	system('sync')
  	system("sudo sed -n 's/0/3/w /proc/sys/vm/drop_caches' /proc/sys/vm/drop_caches")
  	system('sync')
  	system("sudo sed -n 's/3/0/w /proc/sys/vm/drop_caches' /proc/sys/vm/drop_caches")
  	system('free -g')
  	return true
  
  def is_even(n):
  	return n%2 == 0
  
  server = SimpleXMLRPCServer(('0.0.0.0', 8888))
  print 'Listening on port 8888...'
  server.register_function(clear_buffer_cache, 'clear_buffer_cache')
  server.register_function(is_even, 'is_even')
  server.serve_forever()
  
  
subject: fix import error