[Python-ideas] Run length encoding

David Mertz mertz at gnosis.cx
Sun Jun 18 21:47:43 EDT 2017

As an only semi-joke, I have created a module on GH that meets the needs of
this discussion (using the spelling I think are most elegant):


On Sun, Jun 11, 2017 at 1:53 AM, Serhiy Storchaka <storchaka at gmail.com>

> 11.06.17 09:17, Neal Fultz пише:
>>    * other people have been false positive and wanted a SQL-type group
>> by, but got burned
>>         * hence the warnings in the docs.
> This wouldn't help if people don't read the docs.
> Also, if someone rewrote zip in pure python, would many people actually
>> notice a slow down vs network latency, disk IO,  etc?
> Definitely yes.
> RLE is a building block just like bisect.
> This is very specific building block. And if ZIP compression be rewrote in
> pure Python it wouldn't use
> FYI, there are multiple compression methods supported in ZIP files, but
> the zipmodule module implements not all of them. In particular simple RLE
> based methods are not implemented (they almost not used in real world now).
> I suppose that if the zipmodule module implements these algorithms it
> wouldn't use any general RLE implementation.
> https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT
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