Why does QSqlDatabase.open() always return True?

Question

MySQL

I read from the documentation that QSqlDatabase.open() Opens a database connection and returns True on success and False on failure.
But in practice, "at least piss in the eyes - all God's dew."
Regardless of the connection result, I get True.

from PyQt5.QtSql import 
db = QSqlDatabase.addDatabase("QMYSQL")
db.setHostName("acidalia")
db.setDatabaseName("customdb")
db.setUserName("mojito")
db.setPassword("J0a1m8")
ok = db.open()
print(db.open()) #почему всегда True???
db.close()

Help solve the problem.

Answer 1

db.open()tells you that he connected to the database and now you can work through db