Trying apt(-get) doesn't work, pip doesn't work and downloading the .deb package itself doesn't work either so here we are. I'll post any error messages deemed necessary, thanks in advance.
if anyone runs into trouble with this, I managed to solve this by adding deb http://ftp.nl.debian.org/debian stretch main to /etc/apt/sources.list then doing sudo apt update and finally sudo apt install python-wxgtk3.0