old_contents: #!/usr/bin/python
  
  from airnet import *
  from measures import *
  from filters import *
  from weight import *
  from helper import *
  from main import *
  
new_contents: #!/usr/bin/python
  
  working_path = '/home/hcwu/work/research/airnet'
  
  import os
  
  os.chdir(working_path)
  
  from airnet import *
  from filters import *
  from weight import *
  from helper import *
  from count import *
  from aggregate import *
  
  from main import *
  
subject: change current dirc when load