Matlab engine for python import failure

Mac OS X 10.10.3, Python 3.4.3, Matlab2015a.

I installed the matlab engine for python according to the instruction found here. However, whenever I try to import matlab.engine in python, I will get the following error message:

Python 3.4.3 (default, Apr  7 2015, 08:05:21) 
Type "copyright", "credits" or "license" for more information.

IPython 3.1.0 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object', use 'object??' for extra details.
Using matplotlib backend: MacOSX

In [1]: import matlab.engine
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
/usr/local/lib/python3.4/site-packages/matlab/engine/__init__.py in <module>()
     40 try:
---> 41     pythonengine = importlib.import_module("matlabengineforpython"+_PYTHONVERSION)
     42 except:

/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/importlib/__init__.py in import_module(name, package)
    108             level += 1
--> 109     return _bootstrap._gcd_import(name[level:], package, level)
    110 

/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/importlib/_bootstrap.py in _gcd_import(name, package, level)

/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/importlib/_bootstrap.py in _find_and_load(name, import_)

/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/importlib/_bootstrap.py in _find_and_load_unlocked(name, import_)

ImportError: No module named 'matlabengineforpython3_4'

During handling of the above exception, another exception occurred:

ImportError                               Traceback (most recent call last)
/usr/local/lib/python3.4/site-packages/matlab/engine/__init__.py in <module>()
     56                 os.environ[_envs[_arch]] = _bin_dir
---> 57         pythonengine = importlib.import_module("matlabengineforpython"+_PYTHONVERSION)
     58     except:

/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/importlib/__init__.py in import_module(name, package)
    108             level += 1
--> 109     return _bootstrap._gcd_import(name[level:], package, level)
    110 

/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/importlib/_bootstrap.py in _gcd_import(name, package, level)

/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/importlib/_bootstrap.py in _find_and_load(name, import_)

/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/importlib/_bootstrap.py in _find_and_load_unlocked(name, import_)

/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/importlib/_bootstrap.py in _load_unlocked(self)

/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/importlib/_bootstrap.py in _load_backward_compatible(self)

/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/importlib/_bootstrap.py in _check_name_wrapper(self, name, *args, **kwargs)

/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/importlib/_bootstrap.py in load_module(self, fullname)

/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/importlib/_bootstrap.py in _call_with_frames_removed(f, *args, **kwds)

ImportError: dlopen(/Applications/MATLAB_R2015a.app/extern/engines/python/dist/matlab/engine/maci64/matlabengineforpython3_4.so, 2): Library not loaded: @rpath/libpython3.4m.dylib
  Referenced from: /Applications/MATLAB_R2015a.app/extern/engines/python/dist/matlab/engine/maci64/matlabengineforpython3_4.so
  Reason: image not found

During handling of the above exception, another exception occurred:

OSError                                   Traceback (most recent call last)
<ipython-input-1-7ec811bb5400> in <module>()
----> 1 import matlab.engine

/usr/local/lib/python3.4/site-packages/matlab/engine/__init__.py in <module>()
     57         pythonengine = importlib.import_module("matlabengineforpython"+_PYTHONVERSION)
     58     except:
---> 59         raise EnvironmentError('The installation of MATLAB Engine for Python is '
     60                                 'corrupted.  Please reinstall it or contact '
     61                                 'MathWorks Technical Support for assistance.')

OSError: The installation of MATLAB Engine for Python is corrupted.  Please reinstall it or contact MathWorks Technical Support for assistance.

Answer 1

[Bo Li]

The error message "Library not loaded: @rpath/libpython3.4m.dylib" indicates that the Python library is not found. Are you able to find the file "libpython3.4m.dylib" in folder "/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/"?

If so, you can try to set the environment variable DYLD_LIBRARY_PATH. In csh, this is the command:

setenv DYLD_LIBRARY_PATH /usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/

[Evan]

This did not work for me:

>>> import os
>>> os.environ['DYLD_LIBRARY_PATH'] = '/Users/Evan/miniconda/lib/'
>>> import matlab.engine
Traceback (most recent call last):
  File "/Users/Evan/miniconda/lib/python3.4/site-packages/matlab/engine/__init__.py", line 41, in <module>
    pythonengine = importlib.import_module("matlabengineforpython"+_PYTHONVERSION)
  File "/Users/Evan/miniconda/lib/python3.4/importlib/__init__.py", line 109, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
  File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
  File "<frozen importlib._bootstrap>", line 2224, in _find_and_load_unlocked
ImportError: No module named 'matlabengineforpython3_4'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/Evan/miniconda/lib/python3.4/site-packages/matlab/engine/__init__.py", line 57, in <module>
    pythonengine = importlib.import_module("matlabengineforpython"+_PYTHONVERSION)
  File "/Users/Evan/miniconda/lib/python3.4/importlib/__init__.py", line 109, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
  File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
  File "<frozen importlib._bootstrap>", line 2226, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 1191, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 1161, in _load_backward_compatible
  File "<frozen importlib._bootstrap>", line 539, in _check_name_wrapper
  File "<frozen importlib._bootstrap>", line 1715, in load_module
  File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
ImportError: dlopen(/Applications/MATLAB_R2015a.app/extern/engines/python/dist/matlab/engine/maci64/matlabengineforpython3_4.so, 2): Library not loaded: @rpath/libpython3.4m.dylib
  Referenced from: /Applications/MATLAB_R2015a.app/extern/engines/python/dist/matlab/engine/maci64/matlabengineforpython3_4.so
  Reason: image not found

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/Evan/miniconda/lib/python3.4/site-packages/matlab/engine/__init__.py", line 59, in <module>
    raise EnvironmentError('The installation of MATLAB Engine for Python is '
OSError: The installation of MATLAB Engine for Python is corrupted.  Please reinstall it or contact MathWorks Technical Support for assistance.