I believe this would be simple to implement when it's needed by subclassing `collections.UserList` and wrapping this functionality around `__getitem__`, `__setitem__`, and `__delitem__`.
On Tue, Nov 24, 2020, 2:38 PM Mathew M. Noel via Python-ideas < python-ideas@python.org> wrote: > Python uses an index of -1 to index the last element in a list. Since -1 > occurs before 0 we might think of the elements of the linear list are being > bent into a circle making the last element occur before the 0th element. > Consider a list with n elements: it would be perfectly reasonable to > address the element 0 of the list using an index of n since n occurs after > n-1 (if we assume that the list is bent into a circle). This feature can > prove to be extremely useful. Consider the following example: > > > days_of_the_week = > ["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"] > > It would be nice if > > days_of_the_week[0] > > is the same as > > days_of_the_week[7] > > is the same as > > days_of_the_week[14] etc > > In other words use modular indexing. > In other words if the index is outside the range 0 to n-1, we simply take the > remainder when the index is divided by n as the index. > Because of the close relationship between finite length sequences and > periodic sequences this feature might simplify scientific computing(circular > convolution etc). > > > > _______________________________________________ > 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/ZEH5W2XBYSHKU733WSLGQEIIPOFSVBIU/ > Code of Conduct: http://python.org/psf/codeofconduct/ >
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