Fastest way to generate delimited string from 1d numpy array

Question

I have a program which needs to turn many large one-dimensional numpy arrays of floats into delimited strings. I am finding this operation quite slow relative to the mathema

Answer 1

Using imap from itertools instead of map in the OP's code is giving me about a 2-3% improvement which isn't much, but something that might combine with other ideas to give more improvement.

Personally, I think that if you want much better than this that you will have to use something like Cython.