old_contents: #!/usr/bin/python
  
  from __future__ import absolute_import
  
  import sys
  
  import pyairview
  
  if __name__ == '__main__':
      sys.exit(0)
      
new_contents: #!/usr/bin/env python
  
  from __future__ import absolute_import
  
  import sys
  
  import pyairview
  
  if __name__ == '__main__':
      sys.exit(0)
      
subject: Update hashbang in testing file