$ sudo apt-get update
$ sudo apt-get install pyqt5-examples 

pyqt5-examples is installed in your system.

Make ensure the pyqt5-examples package were installed using the commands given below,

$ sudo dpkg-query -l | grep pyqt5-examples *

You will get with pyqt5-examples package name, version, architecture and description in a table

pyqt5-examples package basic information: