Python Numpy package is likely broken. Importing its subpackage raises an exception

> 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.
>
> Original error was: libgfortran.so.5: cannot open shared object file: No such file or directory


Additional info:
* python 3.6
* package version(s): python-numpy 1.14.3-1


Steps to reproduce:
1. run python
2. and type `import numpy.core.numeric`