[ this request /discussion refers to numpy issue #5863 https://github.com/numpy/numpy/pull/5863#issuecomment-159738368 ] Dear all, As far as I can think, the expected functionality of np.array(...) would be np.array(list(...)) or something even nicer. Therefore, I like to request a generator/iterator support for np.array(...) as far as list(...) supports it. A more detailed reasoning behind this follows now. In general it seems possible to identify iterators/generators as needed for this purpose: - someone actually implemented this feature already (see #5863 https://mail.google.com/mail/u/0/%E2%80%8Bhttps://github.com/numpy/numpy/pul... ) - there is ``type.GeneratorType`` and ``collections.abc.Iterator`` for ``isinstance(...)`` check - numpy can destinguish them already from all other types which get well translated into a numpy array Given this, I think the general argument goes roughly like the following: PROS (effect maybe 10% of numpy user or more): - more intuitive overall behaviour, array(...) = array(list(...)) roughly - python3 compatibility (see e.g. #5951 https://github.com/numpy/numpy/issues/5951) - compatibility with analog ``__builtin__`` functions (see e.g. #5756 https://github.com/numpy/numpy/issues/5756) - all the above make numpy easier to use in an interactive style (e.g. ipython --pylab) (computation not that important, however coding time well) CONS (effect less than 0.1% numpy user I would guess): - might break existing code which in total, at least for me at this stage, speaks in favour of merging the already existing featurebranch (see #5863 https://mail.google.com/mail/u/0/%E2%80%8Bhttps://github.com/numpy/numpy/pul... ) or something similar into numpy master . Discussion, please! cheers, Stephan