Saving an numpy.ndarray as .ply file in python

[Tina]

hello,

I open an already existing .ply file and modify it in a loop working with the line in this file.
At the end, I have a numpy.ndarray that I would like to save as a .ply file.
How can I do this ?
numpy.ndarray looks like:

array(['ply\n', 'format ascii 1.0\n', 'element vertex 36\n',
       'property float x\n', 'property float y\n', 'property float z\n',
       'property float score\n', 'property float nx\n',
       'property float ny\n', 'property float nz\n',
       'property float size\n', 'property uchar red\n',
       'property uchar green\n', 'property uchar blue\n', 'end_header\n',
       '13.32 12.84 3.06 -0.352745 -0.230493 0.906887 20 0.74 255 255',
       '13.44 12.84 3.06 0.135449 -0.0514792 0.989446 20 0.25 255 255',
       '13.56 12.84 3.024 0.26937 -0.00564067 0.96302 20 0.34 255 255',
       '13.68 12.84 3 0.023836 0.341656 0.939523 20 0.96 255 255 0 \n',
       '13.8 12.84 3 0.17265 0.491562 0.853557 20 0.93 255 255 0 \n',
       '13.92 12.84 2.94 0.271418 0.421348 0.865331 20 0.55 255 255 0',
       '13.92 13.44 2.412 0.592844 0.469536 0.654272 1 0.28 255 0 0 \n',
       '\n'],
      dtype='|S61')