How can I modify/overwrite a pointcloud ply file with python?

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I have read the lon dress pointcloud.ply file and I converted theRGB channel into ycbcr so from x,y,z,r,g,b 6channelt to x,y,z,ycbcr 4 channel. But I couldn't find how to overwrite the original ply flw with the changes I made.

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