and emailand potentially distutilsimpacts in this booktime has new portable calls in (see and an implementation of the __import__ function in importlib __import__in part to unify and more clearly expose its implementation (see and new capability in the windows installer that extends the system path setting to include ' directory as an install-time option to simplify some command lines (see appendixes and ba new windows launcherwhich attempts to interpret unix-style #lines for dispatching python scripts on windowsand allows both #lines and new py command lines to select between python and versions explicitly on both perfile and per-command basis (see the new appendix bchanges in python python continued the line' evolution it was developed during moratorium on core language changesso its relevant changes were minor here' quick review of major changesand their location in this fifth edition where relevantbyte-code files storage model change__pycache__ (see and the struct module' autoencoding for strings is gone (see and str/bytes split supported better by python itself (not relevant to this bookthe cgi escape call was to be moved in (not relevant to this bookthreading implementation changetime slices (not relevant to this bookfourth edition python changes the fourth edition was updated to cover python and and incorporated small number of major changes made in its and changes apply to all future releases in the line including this fifth edition' python and its changes are also part of this edition' as noted earliersome of the changes described here as changes also later found their way into python as back-ports ( set literalsand set and dictionary comprehensionschanges in python in addition to the and changes listed in upcoming sectionsshortly before going to press the fourth edition was also augmented with notes about prominent extensions in the then upcoming python releaseincluding appendix cpython changes and this book