[issue20399] Comparison of memoryview

[Josh Rosenberg]

Josh Rosenberg <shadowranger+python at gmail.com> added the comment:

The lack of support for the rich comparison operators on even the most basic memoryviews (e.g. 'B' format) means that memoryview is still a regression from some of the functionality buffer offered back in Python 2 ( https://stackoverflow.com/a/13574862/364696 ); you either need to convert back to bytes (losing the zero-copy behavior) or hand-write a comparator of your own to allow short-circuiting (which thanks to sort not taking cmp functions anymore, means you need to write it, then wrap it with functools.cmp_to_key if you're sorting, not just comparing individual items).

While I'll acknowledge it gets ugly to try to support every conceivable format, it seems like, at the very least, we could provide the same functionality as buffer for 1D contiguous memoryviews in the 'B' and 'c' formats (both of which should be handleable by a simple memcmp).

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nosy: +josh.r

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