new_contents: # -*- coding: utf-8 -*-
  import io
  
  def read(*filenames, **kwargs):
      encoding = kwargs.get('encoding', 'utf-8')
      sep = kwargs.get('sep', '\n')
      buf = []
      for filename in filenames:
          with io.open(filename, encoding=encoding) as f:
              buf.append(f.read())
      return sep.join(buf)
  
subject: Add text_files.py with read function