How To Code Loading Screen

Question

How do programmers code proper loading screens? This is how I envision the code behind a loading screen, but I was wondering if there is a better way than just a bunch of conditional statements:

loading = 0
def load(percent):
    while percent <= 100:
        if percent == 0:
            foo.loadthing() # Just an example function
            percent += 10
        else if percent == 10:
            foo.loadthing()
            percent += 10

        ...

        else if percent == 100:
            foo.loadthing()
load(loading);

Answer 1

I think you got it backward. I wouldn't code a loading screen based from a loading screen.

Not sure about your language i hope you'll understand my c# prototype

//Gui thread
var screen = LoadingScreen.Show();
await doWork(); //<- c# way to make doWork happen on 2nd thread and continue after the thread has been finished.
screen.Hide();

//somewhere else
async void doWork() {
   for(int i = 0; i < filesToLoad; ++i) {
      LoadFile(i);
      LoadingScreen.SetPercentage = 100.0 * i / filesToLoad;
   }
}

what you see happening here is 2 threads. 1 thread (gui) that shows the loadingscreen for as long as the 2nd thread is doing work. This 2nd thread will send updates to the loading screen saying 'hey i did some more work, please update'

Update Ah now i see you're using python. My idea should still stand though. You should loop over the work you need to be doing and then calculate the updates from there.