How to compile multiple python files into one using Pyinstaller?

I am doing a calculation program that is divided into 3 files py :

• graphical interface file ( cerberus.py )
• file that carries out the calculations ( calc.py )
• file responsible for plotting data ( plot.py )

I tried to compile with the command:

pyinstaller --onefile --windowed cerberus.py

But when you opened the resulting file, it was no longer calculating or plotting on the canvas, it was " inerte ". How do I resolve this?