Heroku buildpack: Python with Numpy, Scipy, scikit-learn

This is a Heroku buildpack for Python apps, powered by pip.

This buildpack enables you to compile Numpy, Scipy, scikit-lern etc on Heroku.
! I recommends you to use conda-buildpack. Because of compile timeout issue (see below).

Usage of this buildpack

1.use heroku-buildpack-multi

$ heroku config:add BUILDPACK_URL=https://github.com/heroku/heroku-buildpack-multi.git

(You can set buildpack when creating the app. please see the official document.)

2.edit .buildpacks for heroku-buildpack-multi as below.

https://github.com/ddollar/heroku-buildpack-apt
https://github.com/icoxfog417/heroku-buildpack-python.git#statistics

3.edit Aptfile for heroku-buildpack-apt as below.

build-essential
gfortran
libgfortran3
python-dev
libblas-dev
libatlas-base-dev
cython

4.locate .buildpacks and Aptfile to your application root, then push to heroku.

Caution: Scipy takes long time to compile. So Numpy, Scipy, scikit-learn at once will cause compile timeout on Heroku.
To avoid it, exclude scikit-learn from your requirements.txt on first push, after that restore it and push again.

Usage

Example usage:

$ ls
Procfile  requirements.txt  web.py

$ heroku create --buildpack git://github.com/heroku/heroku-buildpack-python.git

$ git push heroku master
...
-----> Python app detected
-----> Installing runtime (python-2.7.9)
-----> Installing dependencies using pip
       Downloading/unpacking requests (from -r requirements.txt (line 1))
       Installing collected packages: requests
       Successfully installed requests
       Cleaning up...
-----> Discovering process types
       Procfile declares types -> (none)

You can also add it to upcoming builds of an existing application:

$ heroku config:add BUILDPACK_URL=git://github.com/heroku/heroku-buildpack-python.git

The buildpack will detect your app as Python if it has the file requirements.txt in the root.

It will use Pip to install your dependencies, vendoring a copy of the Python runtime into your slug.

Specify a Runtime

You can also provide arbitrary releases Python with a runtime.txt file.

$ cat runtime.txt
python-3.4.3

Runtime options include:

• python-2.7.9
• python-3.4.3
• pypy-2.4.0 (unsupported, experimental)
• pypy3-2.4.0 (unsupported, experimental)

Other unsupported runtimes are available as well.