Unable to load DLL python module in PyCharm. Works fine in IPython

Question

When I use the IPython included with Enthought Python Distribution, I can import the pyvision package just fine. However, when I try to import pyvision inside of PyCharm 1.2.1, I get the following errors

  File "C:\Python27\lib\site-packages\pyvision\__init__.py", line 146, in <module>
    from pyvision.types.img import Image,OpenCVToNumpy,NumpyToOpenCV
  File "C:\Python27\lib\site-packages\pyvision\types\img.py", line 43, in <module>
    import numpy
  File "C:\Python27\lib\site-packages\numpy\__init__.py", line 142, in <module>
    import add_newdocs
  File "C:\Python27\lib\site-packages\numpy\add_newdocs.py", line 9, in <module>
    from numpy.lib import add_newdoc
  File "C:\Python27\lib\site-packages\numpy\lib\__init__.py", line 13, in <module>
    from polynomial import *
  File "C:\Python27\lib\site-packages\numpy\lib\polynomial.py", line 17, in <module>
    from numpy.linalg import eigvals, lstsq
  File "C:\Python27\lib\site-packages\numpy\linalg\__init__.py", line 48, in <module>
    from linalg import *
  File "C:\Python27\lib\site-packages\numpy\linalg\linalg.py", line 23, in <module>
    from numpy.linalg import lapack_lite
ImportError: DLL load failed: The specified module could not be found.

Am I missing some path settings in Windows?

Answer 1

I had the same problem. I'm using Winpython32 and trying to import win32com. Worked everywhere (I tried) except in PyCharm. sys.path and os.environ['PYTHONPATH'] had some extra entries inside Pycharm, but nothing is missing compared to when run elsewhere.

The solution was to start Pycharm within the Winpython console and not using the shortcut.

sys.path and os.environ['PYTHONPATH'] did not change. os.environ['PATH'] had several additional entries set, all related to the python installation. At this point I suspect it has to do with "non-standard" installations. Winpython32 tries to be "portable", while other reports of similar problems are when using Enthought or Python(x,y).

Manually adding:

 C:\WinPython-32\python-2.7.6\
 C:\WinPython-32\python-2.7.6\DLLs
 C:\WinPython-32\python-2.7.6\Scripts

to the system path (the global PATH environment variable in Windows) solved the problem without having to run Pycharm within the Winpython command line. Note: C:\WinPython-32\python-2.7.6\Scripts alone did not solve it.

Answer 2

I've had that problem before, and it seemed to get fixed by repairing Enthought.

EDIT: I just checked, one of my f2py projects was still suffering from this exact error. Repairing Enthought did not work. The solution to my problem actually lay in fixing the Windows path variable. You need to make sure c:\Python27\Scripts (or your equivalent) is in the path. Furthermore, and this is VERY important, make sure each entry in the global and user path environment variables has NO trailing slashes. This breaks the GNU make utility on Windows.