old_contents: import os
  import airpy
  def airlist():
  	installed_docs = os.listdir(airpy.data_directory)
  	for dir in installed_docs:
  		print(dir, end= '  ')
  	print(end = '\n')
new_contents: from __future__ import print_function
  import os
  import airpy
  
  def airlist():
  	installed_docs = os.listdir(airpy.data_directory)
  	for dir in installed_docs:
  		print(dir, end= '  ')
  	print(end = '\n')
  
subject: Add a Backwards compatibility for python 2.7 by adding a __future__ import