[issue39298] add BLAKE3 to hashlib

[Marc-Andre Lemburg]

Marc-Andre Lemburg <mal at egenix.com> added the comment:

With "lean" I meant: doesn't use much code and is easy to compile
and install.

I built a wheel from Jack's experimental package and it comes out to
just under 100kB on Linux x64, compared to around the 1.1MB the
Rust wheel needs:

Archive:  blake3_experimental_c-0.0.1-cp310-cp310-linux_x86_64.whl
  Length      Date    Time    Name
---------  ---------- -----   ----
   348528  2022-03-23 18:38   blake3.cpython-310-x86_64-linux-gnu.so
     3183  2022-03-23 18:38   blake3_experimental_c-0.0.1.dist-info/METADATA
      105  2022-03-23 18:38   blake3_experimental_c-0.0.1.dist-info/WHEEL
        7  2022-03-23 18:38   blake3_experimental_c-0.0.1.dist-info/top_level.txt
      451  2022-03-23 18:38   blake3_experimental_c-0.0.1.dist-info/RECORD
---------                     -------
   352274                     5 files

Archive:  blake3-0.3.1-cp310-cp310-manylinux_2_5_x86_64.manylinux1_x86_64.whl
  Length      Date    Time    Name
---------  ---------- -----   ----
     3800  2022-01-13 01:26   blake3-0.3.1.dist-info/METADATA
      133  2022-01-13 01:26   blake3-0.3.1.dist-info/WHEEL
       48  2022-01-13 01:26   blake3/__init__.py
  4195392  2022-01-13 01:26   blake3/blake3.cpython-310-x86_64-linux-gnu.so
      382  2022-01-13 01:26   blake3-0.3.1.dist-info/RECORD
---------                     -------
  4199755                     5 files

I don't know why there is such a significant difference in size. Perhaps
the Rust version includes multiple variants for different CPU
optimizations ?!

----------

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39298>
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