part igetting started with python loading and running existing applications running your application immediately after you write it is fun and interestingbut at some point you'll close idle and be left with file on your disk the file contains your applicationbut you need to know how to use that file to execute it python actually provides considerable number of ways to achieve this task the following sections describe just three of these approaches using the command line or terminal window the command lineor terminal windowprovides the means to execute commands by typing them in you can also create batch files to execute number of commands as part of batch process in this caseyou're looking at the native command environment provided by the platform you're usingrather than at the specialized python command line when working in this environmentyou type commands to start python and perform specific tasks for exampleif you want to execute firstapp (described in the "creating the applicationsection of this you type python firstapp py and press enter figure - shows typical results you can execute any other application this way as well figure - it' possible to execute an applica tion directly at the com mand line