pip3 install cython fails every time.. It's frustrating.

[Himanshu Mishra]

Hi all,

I want to use Cython over python3, but without installing it for python3, modules do not recognize it.

But

pip3 install cython

does not work. Does it work for all? What am I doing wrong. I also tried adding `sudo` in the start.

Error log.

https://travis-ci.org/OrkoHunter/networkx-metis/jobs/68421029

Thank you very much!

[Stefan Behnel]

The error message is actually pretty clear here:

"""
error: could not create
'/opt/python/3.4.2/lib/python3.4/site-packages/__pycache__/cython.cpython-34.pyc':
Permission denied
"""

It's not a Cython problem but rather a problem with the way you try to
install the packages into the global Python runtime. You should use a
virtualenv instead, as you do for Python 2.7.

Also, for test builds, I recommend installing Cython with the option
"--no-cython-compile", i.e. as plain Python package. That will speed up the
install time considerably.

Stefan

[Hai Nguyen]

my rule of thumb is install conda from miniconda. Installing a bunch of stuff (numpy, cython, ...) will take less than 60 seconds :D

https://travis-ci.org/hainm/pytraj/jobs/68428007#L208

Hai 

 

Stefan

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