[jonathan_landy]

Is np.flatten not a workable option in some cases?

[benkuykendall]

Maybe in some cases, but the performance characteristics are way different. The functions in `more_itertools` return lazy generators, but it looks like `np.flatten` materializes the results in an ndarray.

[rnewme]

Is np part of the itertools?

[benkuykendall]

np is the standard alias for numpy, probably the most popular numerical and array processing library for python. So, no, not part of the standard lib at all. But a universal import for most users of the language in any science/stats/ml environment. That said, still a surprising place from which to import a basic stream processing function.