code: def _buf_append(self, string):
          '''Replace string directly without appending to an empty string,
          avoiding type issues.'''
          if not self._buf:
              self._buf = string
          else:
              self._buf += strinf _buf_append(self, string):
          '''Replace string directly without appending to an empty string,
          avoiding type issues.'''
          if not self._buf:
              self._buf = string
          else:
              self._buf += string
docs: Replace string directly without appending to an empty string,
          avoiding type issues.