[Python] How to place sprites onto rect object in pygame?

I was wondering if any of you knew how to attach a sprite to a rect object I already made in pygame?

Here's my code:

blocktexture1 = pygame.sprite.Sprite()
blocktexture1.rect = self.platforms
for block in self.platforms:
pygame.draw.rect(screen, self.colour, block, 0)


I don't understand which rectangle to apply the sprite rect thing to!

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