old_contents: import collections
  
  
  def is_callable(o):
      return isinstance(o, collections.Callable)
  
new_contents: import collections
  import sys
  
  if sys.platform == 'win32':
      from time import clock as time
  else:
      from time import time
  
  
  def is_callable(o):
      return isinstance(o, collections.Callable)
  
subject: Add platform dependent time import for best resolution.