    def _create_engine(host, user, passwd, db):
        # type: (str, str, str, str) -> None
        '''
        Args:
            host (str): The hostname of the SQL server.
            user (str): The username to use.
            passwd (str): Password for MySQL user.
            db (str): The name of the database to connect to.
        '''
        SQLEngine._conn = MySQLdb.connect(host=host,
                                        user=user,
                                        passwd=passwd,
                                        db=db)
        SQLEngine._cursor = SQLEngine._conn.cursor()
Args:
host (str): The hostname of the SQL server.
user (str): The username to use.
passwd (str): Password for MySQL user.
db (str): The name of the database to connect to.
securitybot/sql.py