How to deal with "importerror numpy core multiarray failed to import" issue.

Question

Hi, everybody. I am using OpenCV 3.4.3 after setting up the OpenCV library. The problem happens because the numpy.core.multiarray can not import when importing cv2:

(D:\Users\XXX\Anaconda3) C:\Users\XXX>python
Python 3.6.3 |Anaconda, Inc.| (default, Oct 15 2017, 03:27:45) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
RuntimeError: module compiled against API version 0xc but this version of numpy is 0xb
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: numpy.core.multiarray failed to import

Please show me methods if anyone know to solve it. Thanks!!!

lyytutoria · Accepted Answer

The cause: The issue happens because your opencv3 version is not matching up with the numpy version. And, you need to bring up to date the new numpy version. Solution: Firstly, you need to go into the console window.

pip install -U numpy

Secondly, the downgrade is finished after being got the following message.

(D:\Users\XXX\Anaconda3) C:\Users\XXX>pip install -U numpy
Collecting numpy
                                                                   Downloading 
https:files.pythonhosted.org/packages/51/70/7096a735b27359dbc0c380b23b9c9bd05f
ea62233f95849c43a6b02c5f40/numpy-1.15.4-cp36-none-win_amd64.whl (13.5MB)
  100% | ██████████ █████████████████████ | 13.5MB 27kB/s
Installing collected packages: numpy
Found existing installation: numpy 1.12.0
 Uninstalling numpy-1.12.0:
  Successfully uninstalled numpy-1.12.0
Successfully installed numpy-1.15.4

Finally, checking again, import cv2 has success.

(D:\Users\XXX\Anaconda3) C:\Users\XXX>python
Python 3.6.3 |Anaconda, Inc.| (default, Oct 15 2017, 03:27:45) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>>

Hope with the above method you can with solve the issue you get. Good luck!!!

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How to deal with “importerror numpy core multiarray failed to import” issue.