Saving an numpy.ndarray as .ply file in python

[Tina]

Sorry,  this package seems to do that: https://github.com/dranjan/python-plyfile

Thanks for the quick reply. I have already read that. It provides a way of reading the file or writing one from scratch. What I want to do is:
1- Read .ply file (as in the link)
2- add an element to the header and to the data as well (for example, before defining the colour I would like to add 'property float score\n' in the header )
3- save the edited version

Can you please help ?