title: What is the difference between .one() and .scalar()
body: <p>What is the main difference between <code>.one()</code> and <code>.scalar()</code> in SQLAlchemy, as both doing the same jobs.</p>
  
  <p>I saw some sites like <a href="https://www.tutorialspoint.com/sqlalchemy/sqlalchemy_orm_returning_list_and_scalars.htm" rel="noreferrer">tutorialpoint.com</a> but that explanation is not enough for me to understand clearly</p>