Python: Why am I encountering this error with importing glpk on MacOSX?

Question

I followed these steps and got my first error:

wget http://www.dcc.fc.up.pt/~jpp/code/python-glpk/python-glpk_0.4.43.orig.tar.gz
tar -xzf python-glpk_0.4.43.orig.tar.gz
cd python-glpk-0.4.43/src/
sudo make install

I got this error:

make -C swig all
make[1]: pyversions: Command not found
gcc -Wall -c -fPIC glpkpi_wrap.c -DHAVE_CONFIG_H -I/usr/include/ -I/usr/lib//config
glpkpi_wrap.c:130:11: fatal error: 'Python.h' file not found
# include <Python.h>
          ^
1 error generated.
make[1]: *** [glpkpi_wrap.o] Error 1
make: *** [all] Error 2

Then I linked to the python by changing the Python version or let's say section: inside swig/Makefile

changed

PYVERS := $(shell pyversions -d)

to

PYVERS := "Python 2.7.6" 

which is my python version

make -C swig all
swig -python  glpkpi.i
./glpk.h:916: Warning 314: 'in' is a python keyword, renaming to '_in'
sed -i 's/:in /:_in /g' glpkpi.py
sed: 1: "glpkpi.py": extra characters at the end of g command
make[1]: *** [glpkpi.py] Error 1
make: *** [all] Error 2

Now when I run python test.py inside the examples folder, it just crashes and says:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/glpk/__init__.py", line 26, in <module>
    from glpk_parser import *
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/glpk/glpk_parser.py", line 352, in <module>
    yacc.yacc(write_tables=0, debug=0)
  File "/Library/Python/2.7/site-packages/ply/yacc.py", line 3244, in yacc
    read_signature = lr.read_table(tabmodule)
  File "/Library/Python/2.7/site-packages/ply/yacc.py", line 1967, in read_table
    if parsetab._tabversion != __tabversion__:
AttributeError: 'module' object has no attribute '_tabversion'

I tried the following tutorials: Build and install from source

then I tried

Installing-Python-glpk Tutorial

Something is just not right, what step am I missing that is causing the

import glpk

to fail?

I tried brew installation as well, no luck! I have included my Python path as well, still no help.

Ah and lastly I tried this:

import sys    

sys.path.append('/Library/Python/2.7/site-packages/glpk/')

still no luck! Last step was inspiration from this answer

Answer 1

Ok, I tried to reproduce your problem and went through the same errors, I managed to make it work by changing the version of ply from 3.6 to 3.4.

Note that I had an error with the glpk library and had to downgrade it to 4.43