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

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

(I found this answer from a video: http://www.youtube.com/watch?v=xmvRF7koJ5E)

  1. Download msvcp71.dll and msvcr71.dll from the web.

  2. Save them to your C:WindowsSystem32 folder.

  3. Save them to your C:WindowsSysWOW64 folder as well (if you have a 64-bit operating system).

Now try running your code file in Python and it will load the graph in couple of seconds.

I had the same issue with importing matplotlib.pylab with Python 3.5.1 on Win 64. Installing the Visual C++ Redistributable für Visual Studio 2015 from this links: https://www.microsoft.com/en-us/download/details.aspx?id=48145 fixed the missing DLLs.

I find it better and easier than downloading and pasting DLLs.

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

For Windows 10 x64 and Python:

Open a Visual Studio x64 command prompt, and use dumpbin:

dumpbin /dependents [Python Module DLL or PYD file]

If you do not have Visual Studio installed, it is possible to download dumpbin elsewhere, or use another utility such as Dependency Walker.

Note that all other answers (to date) are simply random stabs in the dark, whereas this method is closer to a sniper rifle with night vision.

Case study 1

  1. I switched on Address Sanitizer for a Python module that I wrote using C++ using MSVC and CMake.

  2. It was giving this error: ImportError: DLL load failed: The specified module could not be found

  3. Opened a Visual Studio x64 command prompt.

  4. Under Windows, a .pyd file is a .dll file in disguise, so we want to run dumpbin on this file.

  5. cd MyLibrarybuildlib.win-amd64-3.7Debug

  6. dumpbin /dependents MyLibrary.cp37-win_amd64.pyd which prints this:

    Microsoft (R) COFF/PE Dumper Version 14.27.29112.0
    Copyright (C) Microsoft Corporation.  All rights reserved.
    
    
    Dump of file MyLibrary.cp37-win_amd64.pyd
    
    File Type: DLL
    
      Image has the following dependencies:
    
        clang_rt.asan_dbg_dynamic-x86_64.dll
        gtestd.dll
        tbb_debug.dll
        python37.dll
        KERNEL32.dll
        MSVCP140D.dll
        VCOMP140D.DLL
        VCRUNTIME140D.dll
        VCRUNTIME140_1D.dll
        ucrtbased.dll
    
      Summary
    
         1000 .00cfg
        D6000 .data
         7000 .idata
        46000 .pdata
       341000 .rdata
        23000 .reloc
         1000 .rsrc
       856000 .text
    
  7. Searched for clang_rt.asan_dbg_dynamic-x86_64.dll, copied it into the same directory, problem solved.

  8. Alternatively, could update the environment variable PATH to point to the directory with the missing .dll.

Please feel free to add your own case studies here! Ive made it a community wiki answer.

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