def _format_properties(self, prefix=''):
    tokens = []
    if (self.tbl_properties is not None):
        pass
    if (len(tokens) > 0):
        return '\n{}{}'.format(prefix, '\n'.join(tokens))
    else:
        return ''
def _format_properties(self, prefix=):
    tokens = []
    if (self.tbl_properties is not None):
        pass
    if (len(tokens) > 0):
        return '\n{}{}'.format(prefix, '\n'.join(tokens))
    else:
        return 