python environment variables how to set configuration options python command-line arguments python windows launcher command lines for more help the python windows launcher the unix legacy the windows legacy introducing the new windows launcher windows launcher tutorial step using version directives in files step using command-line version switches step using and changing defaults pitfalls of the new windows launcher pitfall unrecognized unix !lines fail pitfall the launcher defaults to pitfall the new path extension option conclusionsa net win for windows python changes and this book major / differences differences -only extensions general remarks changes changes in libraries and tools migrating to fifth edition python changes changes in python changes in python changes in python fourth edition python changes changes in python changes in python and specific language removals in third edition python changes earlier and later python changes solutions to end-of-part exercises part igetting started part iitypes and operations part iiistatements and syntax table of contents xxxi