HeadFirstPython文档，这是官方的PDF，清晰度高。thebasicsGettingStartedQuicklyGetgoingwithPythonprogrammingasquicklyaspossible.Inthischapter,weintroducethebasicsofprogramminginPython,andwedothisintypicalHeadFirststyle:byjumpingrightin.Afterjustafewpages,you’llhaverunyourfirstsampleprogram.Bythee