SQLAlchemy声明性一对多未定义错误

### 解决 SQLAlchemy声明性一对多未定义错误

python
from sqlalchemy import create_engine, ForeignKey
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship, sessionmaker
from sqlalchemy import Column, Integer, String
# 创建引擎和会话
engine = create_engine('sqlite:///example.db')
Base = declarative_base()
Session = sessionmaker(bind=engine)
session = Session()
# 定义作者和文章模型
class Author(Base):
    __tablename__ = 'authors'
    id = Column(Integer, primary_key=True)
    name = Column(String)
    articles = relationship("Article")  # 声明一对多关系
class Article(Base):
    __tablename__ = 'articles'
    id = Column(Integer, primary_key=True)
    title = Column(String)
    author_id = Column(Integer, ForeignKey('authors.id'))  # 外键关联到作者表
# 创建表格
Base.metadata.create_all(engine)