Pandas选择不连续的数据帧日期切片？(Pandas select discontinuous dataframe date slices?)

 试着看看这是否有所不同： 
 
$user = (clone) $this->getServiceLocator()->get('User');
 
 如果您明确告知，服务管理器每次只会为您提供一个新实例 
 
http://framework.zend.com/manual/2.0/en/modules/zend.service-manager.quick-start.html
 
 请注意有关共享服务的部分。 这将告诉服务管理器您每次都想要一个新的User对象，那么您将不需要像上面那样克隆该对象 
 
'shared' => array(
        // Usually, you'll only indicate services that should _NOT_ be
        // shared -- i.e., ones where you want a different instance
        // every time.
        'User' => false,
    ),

Try to see if this makes a difference:
 
$user = (clone) $this->getServiceLocator()->get('User');
 
The service manager will only provide you with a new instance each time if you specifically tell it to
 
http://framework.zend.com/manual/2.0/en/modules/zend.service-manager.quick-start.html
 
Note the part about shared services. This would tell the service manager you want a new User object every time, then you will not need to clone the object as above
 
'shared' => array(
        // Usually, you'll only indicate services that should _NOT_ be
        // shared -- i.e., ones where you want a different instance
        // every time.
        'User' => false,
    ),