[Solved] Why do I get a black screen?

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1. Your WHITE Variable is wrong. That is Black in RGB Format. White is (255,255,255)

2. You are filling the screen and immediately after that you update it.

First fill the screen and THEN you can draw your players on top. 

windowSurface.fill(WHITE)

#Do drawing here

pygame.display.update()

solved Why do I get a black screen?