On Thu, Dec 29, 2022 at 8:50 AM Diogo Valada <diogovalad...@hotmail.com> wrote:
> Hi all, > > New to the mailing list, so I hope I'm creating a discussion in the right > place. > > Am I the only one that thinks that Advanced indexing in numpy doesn't > follow the principle of minimum astonishment? > > for example > > ```python > a = np.random.rand(100, 100) > > a[(2,4)] #this yields the element at [2,4] > a[[2,4]] #this yields the rows at position 2 and 4 > a[1, (2,4)] #this yields the 2nd and 4th elements of row 1. (So actually > does advanced indexing) > a[1, [2,4]] # Works the same way as the previous one. > ``` > > Worst of all, it's very easy for someone do a mistake and not notice it: > it seems to me that the first method, a[(2,4)], should not be allowed, and > instead only a[*(2,4)] should work. How checked how it works in Julia > (which has a similar syntax), and a[(2,4)] would yield an error, which > makes sense to me. Could it be an idea to deprecate a[(2,4)]-like usages? > No, that's not possible. In Python syntax, the comma `,` is what creates the tuple, not the parentheses. So `a[(2,4)]` is exactly `a[2, 4]`. `a[2, 4]` translates to `a.__getitem__((2, 4))`. So there's no way for the array to know whether it got `a[2, 4]` or `a[(2, 4)]`. -- Robert Kern
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