def __verify_db_file_existence(self, database_path):
self.__validate_db_path(database_path)<EOL>if not os.path.isfile(os.path.realpath(database_path)):<EOL><INDENT>raise IOError("<STR_LIT>" + database_path)<EOL><DEDENT>try:<EOL><INDENT>connection = sqlite3.connect(database_path)<EOL><DEDENT>except sqlite3.OperationalError as e:<EOL><INDENT>raise OperationalError(e)<EOL><DEDENT>connection.close()<EOL>
:raises SimpleSQLite.OperationalError: If unable to open database file.