Update cython version

[HaydenCaffrey]

There is an error raising when installing pyworld through pip since July 17th, the error occurs because of the newly released cython, restricting the cython version to <=0.29.36 can help solve the error. Local test succeeded.

[264768502]

Do we require cython as runtime requirement?

[JeremyCCHsu]

It has nothing to do with Cython version. I've confirmed that.

[r9y9]

Hey @JeremyCCHsu, I see installation errors with Cython 3.0.0. How did you confirm that? In my case restricting cython version works okay r9y9/pysptk#96.

[JeremyCCHsu]

Hi @r9y9 . This comment has the hint-- numpy should be installed before cython. Thus the solution is simple: in pyproject.toml, numpy should be listed before cython, so I updated this on the master branch.

What I have problem with PYPI is Travis CI-- it failed to deploy due to some urllib3 v2.0 issue. I'll manually update PyPI when I'm not occupied.

Anyway, installing from current master is working.

conda create -yn testpw0720 python=3.10
pip cache purge

git clone https://github.com/JeremyCCHsu/Python-Wrapper-for-World-Vocoder.git
cd Python-Wrapper-for-World-Vocoder
git submodule update --init

pip install .

For testing:

pip install matplotlib soundfile
cd demo
python demo.py

The culprit isn't Cython:

import pyworld
import cython
>>> cython.__version__
'3.0.0'

[JeremyCCHsu]

My previous conjecture about the package order in pyproject.toml isn't the root cause, though the issue in pyworld is miraculously resolved now.

Something's definitely wrong in the installation pipeline, and Cython seems to be the victim. In the pysptk repo, I did cython _sptk.pyx with Cython version 3.0.0, and the resulting _sptk.c file looks good (40999 lines). Nonetheless, pip install . doesn't work for pysptk, resulting in _sptk.c with one single line saying:

#error Do not use this file, it is the result of a failed Cython compilation.

Anyways, the above are just some of my observations FYI, @r9y9.