Error importing numpy from Flask into Heroku application

Question

I am using Heroku to deploy my Flask application.

Inside my application I am trying to import numpy. This works fine on my localhost, however when I deploy to Heroku the build never completes.

When I check my Heroku logs it is clear that it cannot find numpy.

I have tried putting numpy into my requirments.txt with different version numbers but none seems to work.

I've also tried adding a buildpack which includes numpy, following an example on like this: https://github.com/kennethreitz/conda-buildpack

On the official Heroku python build pack it says: "Some Python packages with obscure C dependencies (e.g. scipy) are not compatible"

Is it possible to import numpy somehow though?

Check the numpy dependencies, and include all of them in your requirements.txt as well? — gtlambert
– gtlambert, Commented Mar 15, 2016 at 10:42
Ah yea, I did not think to check the numpy dependencies... will look into that — William Ross
– William Ross, Commented Mar 15, 2016 at 10:54

sjudǝʊ · Accepted Answer · 2016-03-15 12:17:57Z

1

I'm no expert on heroku, but installing numpy requires compiling of c dependencies and stuff like that. And to be able to do that, the system running your application needs dev packages. Such as python-dev.

In heroku docs is advice to use custom buildpacks to support obscure c dependencies. I've found this buildpack that should support numpy and scipy.

I hope this will work for you.

Cheers!

answered Mar 15, 2016 at 12:17

sjudǝʊ

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