creating python modules as your program gets longeryou may want to split it into several files for easier maintenance you may also want to use handy function that you have written in several programs without copying its definition into each program to support thispython has way to put definitions in file and use them in script or in an interactive instance of the interpreter (the python console window python modules module is file containing python definitions and statements the file name is the module name with the suffix py appended python allows you to split your program into modules that can be reused in other python programs it comes with large collection of standard modules that you can use as the basis of your programs as we have seen examples of in previous not it is time to make your own modules from scratch consider module to be the same as code library file containing set of functions you want to include in your application previously you have been using different moduleslibraries or packages created by the python organization or by others here you will create your own modules from scratch example create your first python module we will create python module with functions the first function should convert from celsius to fahrenheit and the other function should convert from fahrenheit to celsius the formula for converting from celsius to fahrenheit istf (tc / (