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Installing OpenCV - DLL load failed: %1 is not a valid Win32 application [duplicate]

I have a situation very much like the one at Error "ImportError: DLL load failed: %1 is not a valid Win32 application", but the answer there isn't working for me.
My Python code says:
import cv2
But that line throws the error shown in the title of this question.
I have OpenCV installed in C:\lib\opencv on this 64-bit machine. I'm using 64-bit Python.
My PYTHONPATH variable: PYTHONPATH=C:\lib\opencv\build\python\2.7. This folder contains cv2.pyd and that's all.
My PATH variable: Path=%OPENCV_DIR%\bin;... This folder contains 39 DLL files such as opencv_core246d.dll.
OPENCV_DIR has this value: OPENCV_DIR=C:\lib\opencv\build\x64\vc11.
The solution at Error "ImportError: DLL load failed: %1 is not a valid Win32 application" says to add "the new opencv binaries path (C:\opencv\build\bin\Release) to the Windows PATH environment variable". But as shown above, I already have the OpenCV binaries folder (C:\lib\opencv\build\x64\vc11\bin) in my PATH. And my OpenCV installation doesn't have any Release folders (except for an empty one under build/java).
What's going wrong? Can I tell Python to verbosely trace the loading process? Exactly what DLL files is it looking for?
I noticed that, according to http://www.dependencywalker.com/, the cv2.pyd in C:\lib\opencv\build\python\2.7 is 32-bit, whereas the machine and the Python I'm running are 64-bit. Could that be the problem? And if so, where can I find a 64-bit version of cv2.pyd?

Unofficial Windows Binaries for Python Extension Packages
You can find any Python libraries from here.

Please check if the Python version you are using is also 64 bit. If not then that could be the issue. You would be using a 32-bit Python version and would have installed a 64 bit binaries for the OpenCV library.

Wow, I found yet another case for this problem. None of the above worked. Eventually I used python's ability to introspect what was being loaded. For Python 2.7, this means:
import imp
imp.find_module("cv2")
This turned up a completely unexpected "cv2.pyd" file in an Anaconda DLL directory that wasn't touched by multiple uninstall/install attempts. Python was looking there first and not finding my good installation. I deleted that cv2.pyd file and tried imp.find_module("cv2") again and python immediately found the right file and cv2 started working.
So if none of the other solutions work for you, make sure you use Python introspection to see what file Python is trying to load.

In my case, I have 64-bit Python, and it was lxml that was the wrong version--I should have been using the x64 version of that as well. I solved this by downloading the 64-bit version of lxml here:
https://pypi.python.org/pypi/lxml/3.4.1
lxml-3.4.1.win-amd64-py2.7.exe
This was the simplest answer to a frustrating issue.

I just had this problem. It turns out it was just because I was using an 64-bit version of the OpenCV file. I tried the x86 and it worked.

I had the same problem. Here's what I did:
I downloaded the pywin32 wheel file from here, then
I uninstalled the pywin32 module. To uninstall, execute the following command in a command prompt.
pip uninstall pywin32
Then, I reinstalled pywin32. To install it, open the command prompt in the same directory where the pywin32 wheel file lies. Then execute the following command.
pip install <Name of the wheel file with extension>
Wheel file will be like: piwin32-XXX-cpXX-none-win32.whl
It solves the problem for me.

I copied cv2.pyd file from /opencv/build/python/2.7/x86 folder instead of from /x64 folder to C:/Python27/Lib/site-packeges. I followed rest of the instructions provided here.
Added by someone else, not verified: I also copy file cv2.pyd to folder C:/Python27/Lib/site-packages/cv2. It works.

For me the problem was that I was using different versions of Python in the same Eclipse project. My setup was not consistent with the Project Properties and the Run Configuration Python versions.
In menu Project → Properties → PyDev, I had the Interpreter set to Python 2.7.11.
In Run Configurations → Interpreter, I was using the Default Interpreter. Changing it to Python 2.7.11 fixed the problem.

If your build system (CMake in my case) copies the file from <name>.dll to <name>.pyd, you will get this error if the original file wasn't actually a DLL file. In my case, building shared libraries got switched off, so the underlying file was actually a *.lib.
I discovered this error by loading the pyd file in Dependency Walker and finding that it wasn't valid.

Update NumPy.
pip install numpy --upgrade
It works for me!

This one worked for me:
pip install -- pywin32==227

I faced the same issue when I uninstalled and reinstalled a different version of 2.7.x of Python on my system using a 32-bit Windows Installer. I got the same error on most of my import statements.
I uninstalled the newly installed Python, downloaded a 64-bit Windows installer, reinstalled Python again, and it worked.

So I had problems installing vtk under Windows (as I use Python 3.7, there isn't any binary available so far. Just for older Python versions pip install vtk is not working)
I did wrote Python in my cmd:
Python 3.7.3 on win32
So I now know I have Python 3.7.3 running on a 32 bit.
I then downloaded the correct wheel at VTK‑8.2.0‑cp37‑cp37m‑win32.whl
Next I installed that wheel:
pip install VTK-8.2.0-cp37-cp37m-win32.whl
Then I tested it and it worked:
python
import vtk

I experienced the same problem while trying to write code concerning speech-to-text.
The solution was very simple. Uninstall the previous pywin32 using the pip method:
pip uninstall pywin32
The above will remove the existing one which is by default for 32 bit computers. And install it again using
pip install pywin32
This will install the one for the 64 bit computer which you are using.

I had a similar issue while trying to run uvicorn,
Creating a new virtual environment and reinstalling the python packages worked

You can install opencv from official or unofficial sites.
Refer to this question and this issue if you are using Anaconda.

It has a very simple solution.
After installing opencv
place
cv2.pyd from C:\opencv\build\python\2.7\ **x64** to C:\Python27\Lib\site-packages
instead of, place cv2.pyd from C:\opencv\build\python\2.7\ **x86** to C:\Python27\Lib\site-packages

I got this error when trying to import MySQLdb.
What worked for me was to uninstall Python and then reinstall it.
I got the error after installing npm (https://www.npmjs.com/get-npm). One thing it did was install Python even though I already had it.

First I copied cv2.pyd from /opencv/build/python/2.7/x86 to C:/Python27/Lib/site-packeges. The error was
"RuntimeError: module compiled against API version 9 but this version of numpy is 7"
Then I installed numpy-1.8.0-win32-superpack-python2.7.exe and OpenCV works fine.
>>> import cv2
>>> print cv2.__version__
2.4.13

Please make sure that you have installed a Python 2.7.12 or below version. Otherwise you will definitely get this error.
Make sure the Oracle client is 64 bit installed if the OS is 64 bit.
Make sure the Microsoft Visual C++ compiler for Python 2.7 is 64 for bit for a 64 bit OS or 32 bit for 32 bit.
Note: If your OS is 64 bit, install all packages of 64 bit or if the OS is 32 bit, install the 32-bit package.

This has worked for me. I have tried different methods, but this was my best solution.
Open a command prompt and type the following;
pip install opencv-python
(Make sure your Internet connection is on.)
After that, try importing it again.

It could also be that your Anaconda version is 32 bit when it should be 64 bit.

If you are using pycharm I go to settings -> python interpretation and click the + button and search for the name on the list of python packages there
An image showing where to go when you want to install something

I found the solution. Maybe you can try to use the cmd window rather than the Anaconda prompt window to start your first Scrapy test.

Importerror on win32ui for 32 bit Python

I've been trying to run a bot for Super Hexagon (Just for fun), but when I try to run the module in IDLE 2.7.11 (32 bit) I get the error
Traceback (most recent call last) :
File "C:\Users(Me)\Desktop\Super-Hexagon-Bot\super_hexagon_bot.py", line 8, in < module >
import win32ui
ImportError: No module named win32ui
Unfortunately, right now I'm streaming my desktop to my Macbook, so I can't copy the code, but here's an image of the part the program has an error with.
I have 64 bit Windows 8, so the win32ui is most likely the problem, but I'm not sure how to change the code to accomodate 64 bit. Any suggestions?

I think the problem is not the the BIT version from your Windows PC.
It seems to me, that you have not installed he module win32ui.
After searching the web, I have found, the module pywin32, which should include all necessary WIN thinks.
You can install it via pip, easy_install of with these MSI installer:
http://sourceforge.net/projects/pywin32/files/pywin32/
Please use the newest and correct version.
But I think you have to change the code:
Sorry I have no Windows PC, so I could not try it, maybe something like that:
from pywin32 import *

It's most likely the Python libraries you are using here, is causing the issue. There is 64 bit build for python win32ui.
http://sourceforge.net/projects/pywin32/files/pywin32/Build%20219/
Download and install one of then and set the build path and import accordingly.

MySQL does not work after installation [duplicate]

I installed Python 3.1 and the Pygame module for Python 3.1. When I type import python in the console I get the following error:
Traceback (most recent call last):
File "<pyshell#2>", line 1, in <module>
import pygame
File "C:\Python31\lib\site-packages\pygame\__init__.py", line 95, in <module>
from pygame.base import *
ImportError: DLL load failed: %1 is not a valid Win32 application.

It could be due to the architecture of your OS. Is your OS 64 Bit and have you installed 64 bit version of Python? It may help to install both 32 bit version Python 3.1 and Pygame, which is available officially only in 32 bit and you won't face this problem.
I see that 64 bit pygame is maintained here, you might also want to try uninstalling Pygame only and install the 64 bit version on your existing python3.1, if not choose go for both 32-bit version.

Looks like the question has been long ago answered but the solution did not work for me. When I was getting that error, I was able to fix the problem by downloading PyWin32

I had installed Python 32 bit version and psycopg2 64 bit version to get this problem. I installed psycopg2 32 bit version and then it worked.

Had this issue on Python 2.7.9, solved by updating to Python 2.7.10 (unreleased when this question was asked and answered).

Another possible cause of similar issue could be wrong processorArchitecture in the cx_freeze manifest, trying to load x86 common controls dll in x64 process - should be fixed by this patch:
https://bitbucket.org/anthony_tuininga/cx_freeze/pull-request/71/changed-x86-in-windows-manifest-to/diff

python does not find wxPython

In order to start building a gui I've decided to install wxPython, however I can't get it working. I run python 2.7.6 (in IDLE it shows: Python 2.7.6 (default, Nov 10 2013, 19:24:24) [MSC v.1500 64 bit (AMD64)] on win32) and it works fine.
When I however try to install a 32 bit or 64 bit version of wxPython from http://www.wxpython.org/download.php it doesn't work, meaning that when I run:
import wx
I get the following message:
Traceback (most recent call last):
File "C:\Users\****\Desktop\Python GUI test\test1.py", line 2, in <module>
import wx
ImportError: No module named wx
I think it might go wrong with the place where it installs wxPython. Normally however it uses the right directory automatically. It tries to install in the following dir:
C:\Users\****\AppData\Local\Enthought\Canopy32\User\Lib\site-packages
Which is in a program called Canopy which I once installed but don't know how to get rid off. I've installed it in this dir and I've also installed it within the dir where Python is installed:
C:\Python27\Lib\site-packages
Both of these locations don't work.
Anyone has an idea where things go wrong?

I would suggest to clean up your installations. Canopy is part of Enthought, so if you don't need this anymore de-install it, I would think you can do that from: Control Panel\All Control Panel Items\Programs and Features
Then re/install the Python version you want to use, would suggest 2.7.8 32 bit and then install wxPython 3.0.1 32 bit for Python 2.7.
To test it do not use "Idle" as it is written in Tkinter, which will cause conflicts with wxPython. Just test it with
c:\Python27\python.exe
import wx

"import wx" fails after installation of wxPython on Windows XP

I downloaded and installed this version of wxPython for use with my Python 2.6 installation:
http://downloads.sourceforge.net/wxpython/wxPython2.8-win32-unicode-2.8.9.1-py26.exe
When I run Python and try to import wx, I get the following error:
C:\Program Files\Console2>python
Python 2.6 (r26:66721, Oct 2 2008, 11:35:03) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import wx
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "c:\Python26\lib\site-packages\wx-2.8-msw-unicode\wx\__init__.py", line 45, in <module>
from wx._core import *
File "c:\Python26\lib\site-packages\wx-2.8-msw-unicode\wx\_core.py", line 4, in <module>
import _core_
ImportError: DLL load failed: This application has failed to start because the application configuration is incorrect. Reinstalling the application may fix this problem.
>>>
I have already tried removing wxPython and installing again and I got the same error. How can I fix this problem?

I was getting the same error.
After some googling found this link to MSVC++ 2008 Redestributable and installed it.
That solved the problem.

Hate to say this, but I had the same problem, and and import worked fine after a reboot.

Copy the Microsoft C runtime library v.9 files and manifest. That is, msvcr90.dll and microsoft.vc90.crt.manifest from folder python to the folder wx, tha is, folder which contains failed to start DLLs.
Or install the Visual C++ 2008 Redistributable Package.

From looking for "application configuration is incorrect" in the wxPython trac system, the only reference that might make sense is a 64-bit vs 32-bit compatibility issue.
Otherwise, I'd say Brian's answer of trying ANSI is pretty good.
BTW, if you try uninstalling again, make go into the site-packages folder and make sure all the wx and wxPython stuff is deleted.

Try the ANSI version instead of the Unicode one. IIRC it needs to match the Python 2.6 install to work properly.

I too have the same issue.Better install "Portable Python" IDE which comes with some nice modules including wxPython .You can start coding GUI immediately without the need to download a separate wxPython.The link ,
http://www.portablepython.com/

Maybe too late, but I had the same problem and solved that by downloading that from their own website : wxPython2.8-win64-unicode-py27
In my case it initially wanted to setup in somewhere else than my python folder. So I changed it to be in ../python27/Lib/SitePackages/
Then it worked properly.
I hope it helps.

Another late answer, but I recently had issues (8/14) and my solution was to use the 32-bit instead of 64-bit wxPython version.

you try to use the module wxpython 2.8.12.1 version, select the version of your python. you can download it here:
http://www.lfd.uci.edu/~gohlke/pythonlibs/#wxpython