SQLAlchemy query（）返回什么类型的结果？

Question

I've got a table in my database

class Operator(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    login = db.Column(db.String(100))
    calls = db.relationship('Call', backref='operator', lazy='dynamic')

and I want to get all login from this table. So I do

operators = db.session.query(models.Operator.login).all()
print(operators)

And I suppose to get a list of logins but in fact I've got a list of tuples

[('ivanov',), ('petrov',)]

Of course I can manage this data but I can't understand why it's formatted in that way? Why it has empty second element in every tuple? Maybe I do something wrong and there is easier way to get list of logins ?

Answer 1

If you want to get a list of login s something like this will do what you need:

operators = db.session.query(Operator).all()
operators = [op.login for op in operators]

The tuple representation is the standard.