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Python Program Architecture
So far in this book, I’ve sugarcoated some of the complexity in my descriptions of Python programs. In practice, programs usually involve more than just one file; for all but the simplest scripts, your programs will take the form of multifile systems. And even if you can get by with coding a single file yourself, you will almost certainly wind up using external files that someone else has already written.
This section introduces the general architecture of Python programs—the way you divide a program into a collection of source files (a.k.a. modules) and link the parts into a whole. Along the way, we’ll also explore the central concepts of Python modules, imports, and object attributes.
