Multimodule Programs

Some programs bring together a diverse range of tasks, such as loading data from a corpus, performing some analysis tasks on the data, then visualizing it. We may already have stable modules that take care of loading data and producing visualizations. Our work might involve coding up the analysis task, and just invoking functions from the existing modules. This scenario is depicted in Figure 4-2.

Figure 4-2. Structure of a multimodule program: The main program imports functions from two other modules; unique analysis tasks are localized to the main program, while common loading and visualization tasks are kept apart to facilitate reuse and abstraction.

By dividing our work into several modules and using import statements to access functions defined elsewhere, we can keep the individual modules simple and easy to maintain. This approach will also result in a growing collection of modules, and make it possible for us to build sophisticated systems involving a hierarchy of modules. Designing such systems well is a complex software engineering task, and beyond the scope of this book.

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