Description:
Arch's gcc is now 7.1 and no gcc6 is available (like gcc5, gcc49, etc.). /usr/lib/libgfortran.so.3 not exists on gcc 7, but it's needed by numpy. So, numpy is broken currently.

ldd /usr/lib/python3.6/site-packages/numpy/core/multiarray.cpython-36m-x86_64-linux-gnu.so
shows that libgfortran.so.3 is not found.

Additional info:
* package version(s)
extra/python 3.6.1-1
extra/python-numpy 1.12.1-1
core/gcc 7.1.1-2
community/gcc5 5.4.0-1
* config and/or log files etc.


Steps to reproduce:
$ python
Python 3.6.1 (default, Mar 27 2017, 00:27:06)
[GCC 6.3.1 20170306] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
Traceback (most recent call last):
File "/usr/lib/python3.6/site-packages/numpy/core/__init__.py", line 16, in <module>
from . import multiarray
ImportError: libgfortran.so.3: cannot open shared object file: No such file or directory

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3.6/site-packages/numpy/__init__.py", line 142, in <module>
from . import add_newdocs
File "/usr/lib/python3.6/site-packages/numpy/add_newdocs.py", line 13, in <module>
from numpy.lib import add_newdoc
File "/usr/lib/python3.6/site-packages/numpy/lib/__init__.py", line 8, in <module>
from .type_check import *
File "/usr/lib/python3.6/site-packages/numpy/lib/type_check.py", line 11, in <module>
import numpy.core.numeric as _nx
File "/usr/lib/python3.6/site-packages/numpy/core/__init__.py", line 24, in <module>
raise ImportError(msg)
ImportError:
Importing the multiarray numpy extension module failed. Most
likely you are trying to import a failed build of numpy.
If you're working with a numpy git repo, try `git clean -xdf` (removes all
files not under version control). Otherwise reinstall numpy.