code: def write(self):
          '''atomic writing'''
          tmp_file, tmp_fname = tempfile.mkstemp()
          os.close(tmp_file)
          shutil.copystat(self.file_name, tmp_fname)
          self.config.write(open(tmp_fname, 'w'))
          shutil.move(tmp_fname, self.file_namef write(self):
          '''atomic writing'''
          tmp_file, tmp_fname = tempfile.mkstemp()
          os.close(tmp_file)
          shutil.copystat(self.file_name, tmp_fname)
          self.config.write(open(tmp_fname, 'w'))
          shutil.move(tmp_fname, self.file_name)
docs: atomic writing