02_sqlalchemy_None.py

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

engine = create_engine('sqlite:///:memory:')
Session = sessionmaker(bind=engine)

session = Session()
Base = declarative_base()

class User(Base):
    __tablename__ = 'users'
    id = Column(Integer, primary_key=True)
    name = Column(String)


print(session.query(User).filter(User.name is None))  # 1
'''
SELECT users.id AS users_id, users.name AS users_name
FROM users
WHERE 0 = 1
'''

print(session.query(User).filter(User.name.is_(None)))  # 2
'''
SELECT users.id AS users_id, users.name AS users_name
FROM users
WHERE users.name IS NULL
'''