preface if you do not have git then you can obtain zip file of the examples using you can of course install git yourself if you wish to do this see com/downloads versions of the git client for mac oswindows and linux/unix are available here howevermany ides such as pycharm come with git support and so offer another approach to obtaining git repository for more information on git see very good primer and is highly recommended acknowledgements would like to thank phoebe hunt for creating the pixel images used for the starshipmeteors game in chap