我正在使用YAML和SQLAlchemy。我定义了我的对象,并且我可以使用YAML来打印它。但是,当我尝试在从SQLAlchemy查询返回的对象上使用YAML时,它失败,出现错误can't pickle int objects
。我打印出从SQLAlchemy返回的实例,并显示正确的类型。我让代码来说话:对象来自SQLAlchemy时无法清理int对象错误?
class HashPointer(Base):
__tablename__ = 'hash_pointers'
id = Column(Integer, primary_key=True)
hash_code = Column(VARBINARY(64), unique=True)
file_pointer = Column(Text)
def __init__(self, hash_code, file_pointer):
self.hash_code = hash_code
self.file_pointer = file_pointer
def __repr__(self):
return "<HashPointer('%s', '%s')>" % (self.hash_code, self.file_pointer)
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
Engine = create_engine("mysql://user:[email protected]/db", echo=True)
Session = sessionmaker(bind=Engine)
session = Session()
fhash = HashPointer(0x661623708235, "c:\\test\\001.txt")
# PRINTS FINE
print(yaml.dump(fhash))
for instance in session.query(HashPointer).all():
# PRINTS FINE AS __repr__
print instance
# THROWS ERROR, 'CAN'T PICKLE INT OBJECTS'
print(yaml.dump(instance))
“实例”是什么类型?一个yaml.dump(10)工作正常,所以我可能是一个SQLAlchemy类型,它没有所需的酸洗方法。一个__reduce__方法本身返回可选择的类型)。 –