def get_class(table_name, user_table_id, user_score):
class GenericTable(db.Model):
    __tablename__ = table_name
    __table_args__ = {'extend_existing': True}

    id = db.Column(db.Integer, primary_key=True)
    stid = db.Column(db.Integer, unique=True)
    score = db.Column(db.Integer)

    def __init__(self, user_table_id, user_score):
        self.stid = user_table_id
        self.score = user_score

obj = GenericTable(user_table_id, user_score)

return obj