def METHOD_NAME(col1, col2):
    col1_format = getattr(col1.info, "default_format", lambda x: x)
    col2_format = getattr(col2.info, "default_format", lambda x: x)
    return "\n".join(
        TPL.format(col1_format(v1), col2_format(v2)) for v1, v2 in zip(col1, col2)
    )