How to use the pyrfc._exception.RFCError function in pyrfc

# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
# either express or implied. See the License for the specific.
# language governing permissions and limitations under the License.

""" :mod:`pyrfc`-specific exception classes
"""

class RFCError(Exception):
    """ Exception base class

    Indicates that there was an error in the Python connector.
    """
    pass


class RFCLibError(RFCError):
    """ RFC library error

    Base class for exceptions raised by the local underlying C connector (sapnwrfc.c).
    """

    # Results as of: RfcGetRcAsString(RFC_RC rc)
    # cf. material/kjona_getRcAsString
    code2txt = {
        0: u'RFC_OK',
        1: u'RFC_COMMUNICATION_FAILURE',
        2: u'RFC_LOGON_FAILURE',
        3: u'RFC_ABAP_RUNTIME_FAILURE',
        4: u'RFC_ABAP_MESSAGE',
        5: u'RFC_ABAP_EXCEPTION',
        6: u'RFC_CLOSED',
        7: u'RFC_CANCELED',