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Python getter e setter via @property na definição de classe de modelo SqlAlchemy:HOWTO


Você pode usar hybrid_property .Nesse caso, a versão simplificada do seu código deve se parecer com:
from sqlalchemy.ext.hybrid import hybrid_property

class Transcriber(Base):
    __tablename__ = 'transcribers'
    __table_args__ = (
    UniqueConstraint('projectid', 'email'),
    )

    transcriberid = Column(Integer, primary_key=True, server_default=text("nextval('transcribers_transcriberid_seq'::regclass)"))
    projectid = Column(ForeignKey(u'projects.projectid', ondelete=u'CASCADE'), index=True)
    created = Column(DateTime, nullable=False, server_default=text("now()"))
    onwebsite = Column(Boolean, nullable=False, server_default=text("true"))

    _email = Column('email', Text, nullable=False)

    @hybrid_property
    def email(self):
        return self._email

    @email.setter
    def email(self, email):
        self._email = email