Creating Python modules and applications
We relied heavily on modules in the Python library. Additionally, we added several packages, including Pillow and BeautifulSoup. The question should arise, can we create our own module?
The answer is, of course, yes. A Python module is simply a file. It turns out that each example script has been a module. We can look a little more deeply at how we can make our own modules of reusable programming. When we look at Python programs, we observe three kinds of files:
Library modules that are purely definitional
Application modules that do the real work of our applications
Hybrid modules that are both applications and can be used as libraries
The essential ingredient of creating a Python module is separating the real work of the top-level script from the various definitions that support this real work. All our examples of definitions have been functions created with the def statement. The other import examples of definitions are class definitions, which we...
