ORM类的对象无法转换为字符串<img src

class Person:
    def __init__(self, first_name, last_name):
        self.first_name = first_name
        self.last_name = last_name

    def __str__(self):
        return f"{self.first_name} {self.last_name}"

person = Person("John", "Doe")
print(str(person))  # 输出 "John Doe"

from sqlalchemy.ext.declarative import declarative_base

Base = declarative_base()

class Person(Base):
    __tablename__ = 'person'
    first_name = Column(String)
    last_name = Column(String)

    def __repr__(self):
        return f"<Person(first_name='{self.first_name}', last_name='{self.last_name}')>"

person = Person(first_name="John", last_name="Doe")
print(str(person))  # 输出 "<Person(first_name='John', last_name='Doe')>"