pywt: Installing PyWavelets in 3.7b5 causes error

Installing PyWavelets 0.5.2 on a clean virtual environment created by python 3.7b5 causes an error:

Collecting PyWavelets
  Using cached https://files.pythonhosted.org/packages/4b/df/3fff2a8b96ef7df6e4e8642fb7569c3717ae562dd76afe0f96525c0af784/PyWavelets-0.5.2.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-3ow3nsna/PyWavelets/setup.py", line 12, in <module>
        from numpy import get_include as get_numpy_include
    ModuleNotFoundError: No module named 'numpy'
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-3ow3nsna/PyWavelets/

Installing numpy and then PyWavelets causes the issue to go away, however when using requirements.txt to install, it’s not always feasible to do automatically.

About this issue

Original URL
State: closed
Created 6 years ago
Reactions: 4
Comments: 15 (7 by maintainers)

Most upvoted comments

After reading through the numpy issues I got it running now: Installing Cython (pip install Cython) in my virtualenv before running pip install pywavelets does the trick.

Just in case someone else has the same problem.

phwh on Jul 3, 2018

@phwh I think your issue is related to NumPy/Cython rather than PyWavelets itself. The errors look like the ones reported in these issues: numpy/numpy#11483 numpy/numpy#10500

If I use Python 3.7 and numpy 1.14.5 from the default Anaconda channel I can build PyWavelets and all tests pass. Anaconda did not have a Cython package for python 3.7 yet so I had to pip install cython.

I will try to add testing on 3.7 to the CI services in the near future. I am hoping to make a new release in the next few weeks and can add wheels for 3.7 at that time.

For the issue reported by @LiraNuna, we will be adding a pyproject.toml file that will let pip know to first install numpy and cython prior to trying to build PyWavelets.

grlee77 on Jul 3, 2018