How to use the pymssql.DatabaseError function in pymssql

def test_tsql_to_python_exception_translation(self):
        """An error raised by a SP is translated to a PEP-249-dictated, pymssql layer exception."""
        # See https://github.com/pymssql/pymssql/issues/61
        cursor = self.pymssql.cursor()
        # Must raise an exception
        self.assertRaises(Exception, cursor.callproc, 'SPThatRaisesAnError')
        # Must be a PEP-249 exception, not a _mssql-layer one
        try:
            cursor.callproc('SPThatRaisesAnError')
        except Exception as e:
            self.assertTrue(isinstance(e,  pymssql.Error))
        # Must be a DatabaseError exception
        try:
            cursor.callproc('SPThatRaisesAnError')
        except Exception as e:
            self.assertTrue(isinstance(e,  pymssql.DatabaseError))

class Warning(StandardError):
	pass

class Error(StandardError):
	pass

class InterfaceError(Error):
	pass

class DatabaseError(Error):
	pass

class DataError(DatabaseError):
	pass

class OperationalError(DatabaseError):
	pass

class IntegrityError(DatabaseError):
	pass

class InternalError(DatabaseError):
	pass

class ProgrammingError(DatabaseError):
	pass

class NotSupportedError(DatabaseError):
	pass


### cursor object

import datetime

from django.utils import timezone

import pymssql as Database

from sqlserver_ado.base import (
    DatabaseFeatures as _DatabaseFeatures,
    DatabaseOperations as _DatabaseOperations,
    DatabaseWrapper as _DatabaseWrapper)

DatabaseError = Database.DatabaseError
IntegrityError = Database.IntegrityError

VERSION_SQL2000 = 8
VERSION_SQL2005 = 9
VERSION_SQL2008 = 10


def _fix_query(query):
    # For Django's inspectdb tests -- a model has a non-ASCII column name.
    if not isinstance(query, str):
        query = query.encode('utf-8')
    # For Django's backends and expressions_regress tests.
    query = query.replace('%%', '%')
    return query

class DataError(DatabaseError):
	pass

class OperationalError(DatabaseError):
	pass

class IntegrityError(DatabaseError):
	pass

class InternalError(DatabaseError):
	pass

class ProgrammingError(DatabaseError):
	pass

class NotSupportedError(DatabaseError):
	pass


### cursor object

class pymssqlCursor(object):
	"""
	This class represent a database cursor, which is used to issue queries
	and fetch results from a database connection.
	"""

	def __init__(self, src, as_dict):
		"""
		Initialize a Cursor object. 'src' is a pymssqlCnx object instance.
		"""
		self.__source = src

class DatabaseError(Error):
	pass

class DataError(DatabaseError):
	pass

class OperationalError(DatabaseError):
	pass

class IntegrityError(DatabaseError):
	pass

class InternalError(DatabaseError):
	pass

class ProgrammingError(DatabaseError):
	pass

class NotSupportedError(DatabaseError):
	pass


### cursor object

class pymssqlCursor(object):
	"""
	This class represent a database cursor, which is used to issue queries
	and fetch results from a database connection.
	"""

	def __init__(self, src, as_dict):
		"""

class InterfaceError(Error):
	pass

class DatabaseError(Error):
	pass

class DataError(DatabaseError):
	pass

class OperationalError(DatabaseError):
	pass

class IntegrityError(DatabaseError):
	pass

class InternalError(DatabaseError):
	pass

class ProgrammingError(DatabaseError):
	pass

class NotSupportedError(DatabaseError):
	pass


### cursor object

class pymssqlCursor(object):
	"""
	This class represent a database cursor, which is used to issue queries
	and fetch results from a database connection.
	"""

### exception hierarchy

class Warning(StandardError):
	pass

class Error(StandardError):
	pass

class InterfaceError(Error):
	pass

class DatabaseError(Error):
	pass

class DataError(DatabaseError):
	pass

class OperationalError(DatabaseError):
	pass

class IntegrityError(DatabaseError):
	pass

class InternalError(DatabaseError):
	pass

class ProgrammingError(DatabaseError):
	pass

class NotSupportedError(DatabaseError):
	pass

class Error(StandardError):
	pass

class InterfaceError(Error):
	pass

class DatabaseError(Error):
	pass

class DataError(DatabaseError):
	pass

class OperationalError(DatabaseError):
	pass

class IntegrityError(DatabaseError):
	pass

class InternalError(DatabaseError):
	pass

class ProgrammingError(DatabaseError):
	pass

class NotSupportedError(DatabaseError):
	pass


### cursor object

class pymssqlCursor(object):
	"""