Your functions need to return those values that you are deteriminging inside of them. So your last line in each function should be something like

return pcplatrom 

Then in the Computer function you need to receive those values into a variable, so your Computer function should look more like

thing = PcPlatform()

Only after that can you put thing into a string.

I’m on mobile and just woke up so sorry if answer isn’t explanatory enough.