<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _FormatField(self, field):
 """Formats a field. Args: field (str):
 field value. Returns: str: formatted field value. """

    if self._FIELD_DELIMITER and isinstance(field, py2to3.STRING_TYPES):
      return field.replace(self._FIELD_DELIMITER, ' ')
    return field