old_contents: import os
  import os.path
  
  
  def cs_path_exists(fspath):
      if not os.path.exists(fspath): 
          return False
      # make absolute so we always have a directory
      abspath = os.path.abspath(fspath)
      directory, filename = os.path.split(abspath)
      return filename in os.listdir(directory)
new_contents: import os
  import os.path
  
  
  def cs_path_exists(fspath):
      if not os.path.exists(fspath):
          return False
      # make absolute so we always have a directory
      abspath = os.path.abspath(fspath)
      directory, filename = os.path.split(abspath)
      return filename in os.listdir(directory)
  
subject: Remove trailing whitespace