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There are two schools of thought when it comes to installing applications

each application is its own standalone "appliance", and installing and removing them should not disturb the rest of the OS. If the application needs an uncommon library, that library is included in the application's distribution

a collection of small self-contained units called packages

This describes setting up a professional Python project with a real package structure, injection and tests.

Since you are intended to run .py files directly, Python projects should not have source (src) or binary (bin) folders

For the same reason, the test folder should not be separate.  It should be a package in the main project

PyX is a Python package for the creation of PostScript and PDF files. It combines an abstraction of the PostScript drawing model with a TeX/LaTeX interface. Complex tasks like 2d and 3d plots in publication-ready quality are built out of these primitives.

The Python Computer Graphics Kit is an Open Source software package containing a collection of Python modules, plugins and utilities that are meant to be useful for any domain where you have to deal with 3D data of any kind, be it for visualization, creating photorealistic images, Virtual Reality or even games.

Provides access to specialized input hardware such as SpaceMouse/SpaceBall, data glove or tablet via wrappers around the 3DxWare SDK by 3Dconnexion, the Wintab Developer Kit by LCS/Telegraphics and the Data Glove SDK by Fifth Dimension Technologies.

common ways to use doctest: To check that a module’s docstrings are up-to-date by verifying that all interactive examples still work as documented. To perform regression testing by verifying that interactive examples from a test file or a test object work as expected. To write tutorial documentation for a package, liberally illustrated with input-output examples. Depending on whether the examples or the expository text are emphasized, this has the flavor of “literate testing” or “executable documentation”.

Running the module as a script causes the examples in the docstrings to get executed and verified

The file content is treated as if it were a single giant docstring; the file doesn’t need to contain a Python program! For example, perhaps example.txt contains this

a much better way to write GUI apps in Python is to use Trolltech's QT Designer to WYSIWYG-ly create a nice-looking interface, and then automatically generate the necessary code for it with pyuic (which is a UI compiler for QT that comes with the PyQT package.)