Fixing 'ImportError: dlopen(/usr/local/lib/python2.7/site-packages/scipy/fftpack/_fftpack.so, 2): Library not loaded: /usr/local/opt/gcc/lib/gcc/5/libgfortran.3.dylib' with scipy installed via homebrew

scipy.fftpack.homebrew.txt

python /Users/admin/rf/gnuradio/gr-dtv/examples/atsc_ctrlport_monitor.py

python
import scipy
import scipy.fftpack

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/site-packages/scipy/fftpack/__init__.py", line 95, in <module>
    from .basic import *
  File "/usr/local/lib/python2.7/site-packages/scipy/fftpack/basic.py", line 12, in <module>
    from . import _fftpack
ImportError: dlopen(/usr/local/lib/python2.7/site-packages/scipy/fftpack/_fftpack.so, 2): Library not loaded: /usr/local/opt/gcc/lib/gcc/5/libgfortran.3.dylib
  Referenced from: /usr/local/lib/python2.7/site-packages/scipy/fftpack/_fftpack.so
  Reason: image not found
  
scipy installed from: brew install scipy

hint from https://github.com/Homebrew/homebrew-science/issues/3718 - caused by gcc 5 -> 6
library is linking gcc/5, but we have gcc/6

sudo install_name_tool -change /usr/local/opt/gcc/lib/gcc/5/libgfortran.3.dylib /usr/local/opt/gcc/lib/gcc/6/libgfortran.3.dylib /usr/local/lib/python2.7/site-packages/scipy/fftpack/_fftpack.so
sudo install_name_tool -change /usr/local/opt/gcc/lib/gcc/5/libquadmath.0.dylib /usr/local/opt/gcc/lib/gcc/6/libquadmath.0.dylib /usr/local/lib/python2.7/site-packages/scipy/fftpack/_fftpack.so
sudo install_name_tool -change /usr/local/opt/gcc/lib/gcc/5/libgfortran.3.dylib /usr/local/opt/gcc/lib/gcc/6/libgfortran.3.dylib /usr/local/lib/python2.7/site-packages/scipy/fftpack/convolve.so
sudo install_name_tool -change /usr/local/opt/gcc/lib/gcc/5/libquadmath.0.dylib /usr/local/opt/gcc/lib/gcc/6/libquadmath.0.dylib /usr/local/lib/python2.7/site-packages/scipy/fftpack/convolve.so

repeat for other libraries as needed, after fixing, should be able to load:

$ python
>>> import scipy
>>> import scipy.fftpack

and run:

$ python /Users/admin/rf/gnuradio/gr-dtv/examples/atsc_ctrlport_monitor.py
Traceback (most recent call last):
  File "/Users/admin/rf/gnuradio/gr-dtv/examples/atsc_ctrlport_monitor.py", line 147, in <module>
    host = sys.argv[1]
IndexError: list index out of range

https://github.com/Homebrew/homebrew-science/issues/3718

sudo install_name_tool -change /usr/local/opt/gcc/lib/gcc/5/libgfortran.3.dylib /usr/local/opt/gcc/lib/gcc/6/libgfortran.3.dylib /usr/local/lib/python2.7/site-packages/scipy/special/_ufuncs.so
sudo install_name_tool -change /usr/local/opt/gcc/lib/gcc/5/libgfortran.3.dylib /usr/local/opt/gcc/lib/gcc/6/libgfortran.3.dylib /usr/local/lib/python2.7/site-packages/scipy/special/specfun.so
sudo install_name_tool -change /usr/local/opt/gcc/lib/gcc/5/libquadmath.0.dylib /usr/local/opt/gcc/lib/gcc/6/libquadmath.0.dylib /usr/local/lib/python2.7/site-packages/scipy/special/specfun.so
sudo install_name_tool -change /usr/local/opt/gcc/lib/gcc/5/libgfortran.3.dylib /usr/local/opt/gcc/lib/gcc/6/libgfortran.3.dylib /usr/local/lib/python2.7/site-packages/scipy/linalg/_fblas.so
sudo install_name_tool -change /usr/local/opt/gcc/lib/gcc/5/libquadmath.0.dylib /usr/local/opt/gcc/lib/gcc/6/libquadmath.0.dylib /usr/local/lib/python2.7/site-packages/scipy/linalg/_fblas.so
sudo install_name_tool -change /usr/local/opt/gcc/lib/gcc/5/libgfortran.3.dylib /usr/local/opt/gcc/lib/gcc/6/libgfortran.3.dylib /usr/local/lib/python2.7/site-packages/scipy/linalg/_flapack.so
sudo install_name_tool -change /usr/local/opt/gcc/lib/gcc/5/libquadmath.0.dylib /usr/local/opt/gcc/lib/gcc/6/libquadmath.0.dylib /usr/local/lib/python2.7/site-packages/scipy/linalg/_flapack.so

many more.. do all, based on https://github.com/Homebrew/homebrew-science/issues/3718#issuecomment-224997438

sudo -s
find /usr/local/lib/python2.7/site-packages/scipy -name '*.so' | xargs -L1 install_name_tool -change /usr/local/opt/gcc/lib/gcc/5/libquadmath.0.dylib /usr/local/opt/gcc/lib/gcc/6/libquadmath.0.dylib
find /usr/local/lib/python2.7/site-packages/scipy -name '*.so' | xargs -L1 install_name_tool -change /usr/local/opt/gcc/lib/gcc/5/libgfortran.3.dylib /usr/local/opt/gcc/lib/gcc/6/libgfortran.3.dylib
exit