Using modules and packages to organize a program
Modules and packages aren't just there to spread your Python code across multiple source files and directories—they allow you to organize your code to reflect the logical structure of what your program is trying to do. For example, imagine that you have been asked to create a web application to store and report on university examination results. Thinking about the business requirements that you have been given, you come up with the following overall structure for your application:
The program is broken into two main parts: a web interface, which interacts with the user (and with other computer programs ...
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