Use a GUI to select PyPI-classifiers and include them in asetup.py
A small GTK program that loads a list of classifiers from PyPI, displays them in a list with checkboxes. The user can then check any number of checkboxes and the program will generate code suitable to copy & paste into a setup.py script.
pypi-classifiers has three dependencies: GTK, Glib and requests. Most Linux desktop-oriented Linux distros ship these as packages, which are often installed by default. Beyond this, the script is self-contained; instead of installing into a virtualenv, it maybe possible to just copy pypi-classifiers somewhere and run it:
Installation from PyPI works as well (and will install the potentially missing requests dependency), although Gtk should be installed using your distributions package manager (remember to toggleglobalsitepackages).
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.