So, Sequence views that do direct addressing with doubly-linked lists? https://docs.python.org/3/library/collections.abc.html#collections.abc.Sequence
https://docs.python.org/3/library/stdtypes.html#dict-views : > The objects returned by dict.keys(), dict.values() and dict.items() are view objects. They provide a dynamic view on the dictionary’s entries, which means that when the dictionary changes, the view reflects these changes. You may be looking for (directly-addressable) NumPy arrays? https://numpy.org/doc/stable/reference/generated/numpy.array.html https://numpy.org/doc/stable/reference/generated/numpy.ndarray.view.html : > a.view(ndarray_subclass) or a.view(type=ndarray_subclass) just returns an instance of ndarray_subclass that looks at the same array (same shape, dtype, etc.) This does not cause a reinterpretation of the memory. On Tue, Oct 6, 2020, 1:35 PM Alex Hall <alex.moj...@gmail.com> wrote: > On Tue, Oct 6, 2020 at 7:21 PM Christopher Barker <python...@gmail.com> > wrote: > >> >> >> On Tue, Oct 6, 2020 at 10:14 AM Marco Sulla <marco.sulla.pyt...@gmail.com> >> wrote: >> >>> What I do not understand is why you need to use the iterator instead >>> of using the iterable itself. This way you can jump to whatever >>> position without slicing. >>> >> >> if you want the Nth item, that's easy, yes. >> >> if you want to iterate through items N to the end, then how do you do >> that without either iterating through the first N and throwing them away, >> or making a slice, which copies the rest of the sequence? >> > > ```python > for i in range(start, stop): > x = lst[i] > process(x) > ``` > > The only problem is that there's slightly more execution in Python-land > than in C-land, but that only matters if `process(x)` does very little and > you're really concerned about performance. I can see how the proposal could > be useful but only in very limited use cases. > _______________________________________________ > Python-ideas mailing list -- python-ideas@python.org > To unsubscribe send an email to python-ideas-le...@python.org > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/UQ327GHUIHT46AZU73KM562NFEGNGYUQ/ > Code of Conduct: http://python.org/psf/codeofconduct/ >
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