小编use*_*660的帖子

任何人都能解释我的错误 - 以及我如何修复它？

我们用:

• Plone 4
• Zope 2.12.19
• ZEO
• ZODB-暂存

错误日志

Site Error

An error was encountered while publishing this resource.

Sorry, a site error occurred.

Traceback (innermost last):

Module ZPublisher.Publish, line 239, in publish_module_standard
Module ZPublisher.Publish, line 197, in publish
Module ZPublisher.Publish, line 197, in publish
Module ZPublisher.Publish, line 197, in publish
Module ZPublisher.Publish, line 173, in publish
Module plone.app.linkintegrity.monkey, line 17, in zpublisher_exception_hook_wrapper
Module ZPublisher.Publish, line 135, in publish
Module Zope2.App.startup, line 291, in commit
Module transaction._manager, line …

通常我像这样连接/查询

class MyTable(Base):
    __tablename__ = 'mytable'
    __table_args__ = {'schema': 'tables'}

    id = Column(Integer, primary_key=True)
    salutation = Column(VARCHAR(1))

def __init__(self, salutation):
    self.salutation = salutation

def load():
    """"""
    Session = sessionmaker(bind=engine)
    session = Session()
    for i in session.query(MyTable).order_by(MyTable.id):
        entries.append(i.__dict__)
    session.close()

但是我如何在没有任何键的情况下查询（PostgreSQL）数据库视图？

如何计算并显示给定Beginn和给定End之间的所有年份？

我的例子:

for item in folderContents:
    Beginn = item.Beginn.strftime('%Y')
    Ende = item.Ende.strftime('%Y')
    try:
        Beginn = Beginn
        while Beginn <= Ende:
            Beginn = Beginn + 1
            print Beginn
    except:
        pass

谢谢你的帮助...

这是我的清单：

['-50.00', '60.00', '-63.00', '50.00', '-57.00']

我该如何计算这个项目

-50.00+60.00-63.00+50.00-57.00