sqlalchemy/one2one.py at master · ChantYuCN/sqlalchemy · GitHub

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from sqlalchemy import Table, Column, Integer, String, ForeignKey
from sqlalchemy.orm import relationship
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

Base = declarative_base()

class Parent(Base):
    __tablename__ = 'parent'
    id = Column(Integer, primary_key=True)
    name = Column(String(25))
    child = relationship("Child",  back_populates="parent", uselist=False)

class Child(Base):
    __tablename__ = 'child'
    id = Column(Integer, primary_key=True)
    name = Column(String(25))
    parent_id = Column(Integer, ForeignKey('parent.id'))
    parent = relationship("Parent", back_populates="child")

engine = create_engine('mysql+pymysql://root@localhost:3306/test1to1')
session = sessionmaker()
session.configure(bind=engine)
Base.metadata.create_all(engine)