in [ ]if you run idlethe interactive shell is the window that first appears it should be mostly blank except for text that looks something like thispython (tags/vb : deb jun : : [msc bit (amd )on win type "help""copyright""creditsor "licensefor more information in [ ]and are called prompts the examples in this book will use the prompt for the interactive shell since it' more common if you run python from the terminal or command promptthey'll use the promptas well the in [ ]prompt was invented by jupyter notebookanother popular python editor for exampleenter the following into the interactive shell next to the promptprint('helloworld!'after you type that line and press enterthe interactive shell should display this in responseprint('helloworld!'helloworldyou've just given the computer an instructionand it did what you told it to doinstalling third-party modules some python code requires your program to import modules some of these modules come with pythonbut others are third-party modules created by developers outside of the python core dev team appendix has detailed instructions on how to use the pip program (on windowsor pip program (on macos and linuxto install third-party modules consult appendix when this book instructs you to install particular third-party module how to find help programmers tend to learn by searching the internet for answers to their questions this is quite different from the way many people are accustomed to learning--through an in-person teacher who lectures and can answer questions what' great about using the internet as schoolroom is that there are whole communities of folks who can answer your questions xxxvi introduction