[Python-ideas] incremental hashing in __hash__

[jab at math.brown.edu]

I actually have been poking around that code already. I also found
https://github.com/vperron/python-superfasthash/blob/master/superfasthash.py
in case of interest.

But it still seems like library authors with this use case should keep
their library code free of implementation details like this, and instead
use a higher-level API provided by Python.

Thanks,
Josh

On Tue, Dec 27, 2016 at 10:28 PM, Ryan Gonzalez <rymg19 at gmail.com> wrote:

> You could always try to make a Python version of the C tuple hashing
> function[1] (requires the total # of elements) or PyPy's[2] (seems like it
> would allow true incremental hashing). API idea:
>
>
> hasher = IncrementalHasher()
> hasher.add(one_item_to_hash)  # updates hasher.hash property with result
> # repeat
> return hasher.hash
>
>
> [1]: https://hg.python.org/cpython/file/dcced3bd22fe/
> Objects/tupleobject.c#l331
> [2]: https://bitbucket.org/pypy/pypy/src/d8febc18447e1f785a384d52413a34
> 5d7b3db423/rpython/rlib/objectmodel.py#objectmodel.py-562
>
> --
> Ryan (ライアン)
> Yoko Shimomura > ryo (supercell/EGOIST) > Hiroyuki Sawano >> everyone else
> http://kirbyfan64.github.io/
>
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