Re: [Numpy-discussion] optimise operation in array with datetime objects

On Jan 28, 2009, at 3:56 PM, Timmie wrote:

### this is the loop I would like to optimize: ### looping over arrays is considered inefficient. ### what could be a better way? hours_array = dates_array.copy() for i in range(0, dates_array.size): hours_array[i] = dates_array[i].hour

You could try: np.fromiter((_.hour for _ in dates_li), dtype=np.int) or np.array([_.hour for _ in dates_li], dtype=np.int)