New update still suported in ubuntu 14.04 , python 2.7 ? -- error while update

Hello , i am trying to update and go to staging branch which is where the current v11 is maintained,
but after i switch to staging branch , tried bench update , getting the following error , which has nothing to do with branch but for the bench itself see below

i was wondering if there is still support for 2.7 python as i have read they were planning to stop support for it .