python - DLL load failed: The specified module could not be found when doing "from mpi4py import MPI"

Question

I am trying to use Mpi4py 1.3 with python 2.7 on Windows 7 64bits. I downloaded the installable version from here which includes OpenMPI 1.6.3 so in the installed directory (*/Python27Libsite-packagesmpi4pylib) following libraries exist: libmpi.lib, libmpi_cxx.lib, libopen-pal.lib, and libopen-rte.lib. Now in my codes when trying to import it:

from mpi4py import MPI

It returns following error:

ImportError: DLL load failed: The specified module could not be found.

I tried to copy a bove lib files alongside the */Python27Libsite-packagesmpi4pyMPI.pyd and even to Windows/System32, but it didn't work. I appreciate your help on what DLL is missing and how to fix the error?

Answer 1

Using Mpi4py 1.3 with python 3.5 on Windows 10, I can run import mpi4py successfully but not from mpi4py import MPI. To fix it, just reinstall MPI via MPI. This works for me.