changes list of table - or the python changes sectionboth ahead they were already present for xbut have been updated to reflect their availability in as well on the logistical frontper current plans will be the last major series releasebut will have long maintenance period in which it will continue to be used in production work after new development is to shift to the python line that saidit' impossible to foresee how this official posture will stand the test of timegiven ' still very wide user base see the preface for more on thisthe optimized pypy implementationfor exampleis still python only orto borrow monty python line" ' not dead yet "--stay tuned for developments on the python story changes in python python includes surprisingly large number of changes for point release some of these are not entirely compatible with code written for prior release in the line among thesethe new windows launcherinstalled as mandatory part of has broad potential to break existing scripts run on windows here' brief rundown of noteworthy changesalong with their location in this book where applicable python comes witha reduced memory footprint that is more in line with xthanks mainly to its new variable-length string storage schemeand also to its attribute name-sharing dictionaries system (see and new namespace package modelwhere new-style packages may span multiple directories and require no __init__ py file (see new syntax for delegating to subgeneratorsyield from (see new syntax for suppressing exception contextraise from none (see new syntax for accepting ' unicode literal form to ease migration now treats ' unicode literal 'xxxxthe same as its normal string 'xxxx'similar to the way treats ' bytes literal 'xxxxthe same as its normal string 'xxxx(see and reworked os and io exception hierarchieswhich provide more inclusive general superclassesas well as new subclasses for common errors that can obviate the need to inspect exception object attributes (see an all-web-browser-based interface to pydoc documentation started via pydoc -breplacing its former standalone gui client search interfacewhich was in the windows and earlier start button and invoked by pydoc - (see fifth edition python changes