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from typing import Optional
from sqlalchemy import Boolean
from sqlalchemy import Column
from sqlalchemy.orm import declarative_base
Base = declarative_base()
class TestBoolean(Base):
__tablename__ = "test_boolean"
flag = Column(Boolean)
bflag: bool = Column(Boolean(create_constraint=True))
expr = TestBoolean.flag.is_(True)
t1 = TestBoolean(flag=True)
x: Optional[bool] = t1.flag
y: bool = t1.bflag
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