One neat feature, which is expanded on in Pandas as well, is conditional selection. In a numpy array, we can use the
where method to pass a conditional to select items in an array. In this article, we will look at a quick example of how to select elements conditionally.
arr = np.array([1, 2, 3, 4, 5]) ## Select all elements less than 4 np.where(arr < 4)