the order of importing mysql database driver is wrong

try:
    import pymysql as mysql
except ImportError:
    try:
        import MySQLdb as mysql  # prefer the C module.
        mysql_passwd = True
    except ImportError:
        mysql = None

As your comment, we should prefer the C module as default because it has better performance for production but the order of importing mysql database driver is wrong.

It should be great If we can choose our database driver like sqlalchemy.

[coleifer]

So mysql-python (MySQLdb) does not support Python 3, which is why it is no longer preferred. The comment needs to be updated.

If you would like to explicitly use a particular driver, it is quite easy:

import MySQLdb

class MySQLDatabaseCustom(MySQLDatabase):
    def _connect(self):
        return MySQLdb.connect(db=self.database, **self.connect_params)

[coleifer]

No disturbance – I recognize it’s a somewhat opinionated stance and the comment was incorrect, which made it worse. Hope you’re able to get things working.