Description:

$ python -c 'import numpy'

Traceback (most recent call last):
File "<string>", 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 18, in <module>
from .polynomial import *
File "/usr/lib/python3.6/site-packages/numpy/lib/polynomial.py", line 20, in <module>
from numpy.linalg import eigvals, lstsq, inv
File "/usr/lib/python3.6/site-packages/numpy/linalg/__init__.py", line 51, in <module>
from .linalg import *
File "/usr/lib/python3.6/site-packages/numpy/linalg/linalg.py", line 29, in <module>
from numpy.linalg import lapack_lite, _umath_linalg
ImportError: libgfortran.so.3: cannot open shared object file: No such file or directory

Additional info:

$ pacman -Si python-numpy
Repository : extra
Name : python-numpy
Version : 1.12.1-1
Description : Scientific tools for Python
Architecture : x86_64
URL : http://www.numpy.org/
Licenses : custom
Groups : None
Provides : python3-numpy=1.12.1
Depends On : lapack python cblas
Optional Deps : python-nose: testsuite
Conflicts With : python3-numpy
Replaces : python3-numpy
Download Size : 2.43 MiB
Installed Size : 16.35 MiB
Packager : Felix Yan <felixonmars@archlinux.org>
Build Date : Mon 20 Mar 2017 06:06:17 AM -03
Validated By : MD5 Sum SHA-256 Sum Signature

$ uname -a
Linux minime 4.11.3-1-ARCH #1 SMP PREEMPT Sun May 28 10:40:17 CEST 2017 x86_64 GNU/Linux

$ date && sudo pacman -Syu
Thu Jun 1 09:07:53 -03 2017
[sudo] password for ian:
:: Synchronizing package databases...
core is up to date
extra is up to date
community is up to date
multilib is up to date
:: Starting full system upgrade...
there is nothing to do