[PATCH V2] extensions: add notloaded method to return extensions failed to load

[Jun Wu]

On 02/16/2016 02:43 PM, Yuya Nishihara wrote:
> LGTM. I'll change it to .iteritems() and push to the clowncopter,
> thanks.

OpenStack also faces Python 2 to 3 issue like us. They have a style
guide at https://wiki.openstack.org/wiki/Python3 (which recommends items
over iteritems). I wonder if we want a similar style guide to make
Python 3 transition easier.