[Python] How to fade in a text or an image with PyGame

Can someone please help me?

I tried to make some text appear smoothly on the screen.:

def image(name, x, y, u):
screen.blit(name,(x, y))
if u == 1
pygame.display.update()

windows = 'main'
while windows == 'main':
image(background, 0, 0)
image(title, 640, 120)

pygame.display.update()


But text appears very suddenly and not the way I'd expected.

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