The code uses SQLAlchemy Core. However, what I want to know is if writing code in this pattern is recommendable.def saveUser(self, user):        Inserts or updates a user in database.    The method first checks if the provided user's id already exists. If no, then the user will be inserted. Otherwise, the stored values are updated.    Args:        user (User)    Returns:        User object with inserted id        result = self._engine.execute(self._userTable.select().where(self._userTable.c.Id == user._id))    if not result.first():        # user doesn't exist in database.        result = self._engine.execute(self._userTable.insert(), Email=user.email, PasswordHash=user.passwordHash,                                      DisplayName=user.displayName, Active=user.active)        user._id = result.inserted_primary_key[0]    else:        # user already exists in database.        result = self._engine.execute(self._userTable.update().where(self._userTable.c.Id == user._id),                                      Email=user.email, PasswordHash=user.passwordHash, DisplayName=user.displayName, Active=user.active)    return userdef deleteUser(self, userId=None, email=None):        Deletes a user.    Either userId or email can be passed. If both are passed, then a user containing both userId and email will be deleted.    If none of the arguments are provided, then the method call will have not effect.    Args:        userId (int): If this is None, only email will be used to delete the user.        email (str): If this is None, only userId will be used to delete the user.        if not userId and not email:        return # Because an empty and_ clause generated later on will raise OperationalError.    idClause = self._userTable.c.Id == userId if userId else None    emailClause = self._userTable.c.Email == email if email else None    finalClause = and_(idClause, emailClause)    deleteQuery = self._userTable.delete().where(finalClause)    result = self._engine.execute(deleteQuery)
Insert or update a user in database
python;sqlalchemy