ImportError: numpy.core.multiarray failed to import

If you are using python3, the following command fixes the problem on MacOS:

python3 -m pip install numpy -I

pip install opencv-python==3.4.2.17 numpy==1.14.5

did the job for me!

I had the same error message, after trying some of the suggested solutions without success, I found that I needed to run:

pip uninstall numpy

multiple times. Each time several different files were flagged for removal, from different versions of numpy that had accumulated on my system.

Once there was nothing left to uninstall, it was a matter of

pip install numpy

Hope this helps someone!

you may need upgrade pip, it works for me

pip install --upgrade pip
pip install -U numpy

OK so I found a solution that worked for me when trying to get OpenCV to work with Python 3.9 on Windows 10.

This is a known issue for Windows versions past v2004.

In short, the version of NumPY that you need is v1.19.3:

pip uninstall numpy

pip install numpy==1.19.3

Or to do this in one command, use the --force-reinstall flag for pip:

pip install --force-reinstall numpy==1.19.3

I used Anaconda environment and had the same issue. I tried all the aforementioned approaches and, alas, it didn't help me. Accumulated the suggestions, here the way which helped me:

1. Delete all NumPy folders in the virtual environment or in the system if you don't use a virtual environment, for example in my case:

   ~/home/anaconda3/envs//lib/python/site-packages/numpy

   ~/home/anaconda3/envs//lib/python/site-packages/numpy.libs

   ~/home/anaconda3/envs//lib/python/site-packages/numpy-.dist-info

2. Install new Numpy with:

   pip install numpy -U

Hope, it could help in the same case

for me this error came up when installing pygrib with conda and importing it.

conda install -c conda-forge numpy

solved the problem.

pip install numpy==1.19.3

this did the job for me.

I was getting the same error and the problem was solved by updating my numpy installation from 1.7.1 to 1.12.1

pip install -U numpy

The followings were my cmd sequence when the error was occurred, slightly different from the above:

$ python

Python 2.7.12 |Anaconda 4.2.0 (x86_64)| (default, Jul  2 2016, 17:43:17) 

[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)] on darwin

Type "help", "copyright", "credits" or "license" for more information.

Anaconda is brought to you by Continuum Analytics.

Please check out: http://continuum.io/thanks and https://anaconda.org

>>> import cv2

>>> import numpy as np

>>> from matplotlib import pyplot as plt

The same error came for me. The problem is that you might have created a file called numpy.py. This file might coincide with numpy library. So, delete that numpy.py file and the problem gets solved.

It worked for me. So you can try following command

$ pip install numpy -I

I don't really understand this error but I solved this error with below.

pip install -U opencv-python

Hope it was useful!

In my case installing from apt solved my problem.

You can try uninstall it from pip and install from apt (if you are using ubuntu etc.)

pip3 uninstall numpy
sudo apt-get install python3-numpy

run this codes worked for me, seems to be issue with version.

pip uninstall numpy

pip install numpy==1.19.3

All these varied answers suggest that many different problems appear as ImportError: numpy.core.multiarray failed to import.

==> So look for more error information before the stack traceback

E.g. steps to reproduce one such problem (these steps worked fine until numpy 1.20 was released):

# set up a virtualenv
pyenv virtualenv 3.8.7 pip-issue-9542
pyenv local pip-issue-9542

# update pip, setuptools
pip install -U pip setuptools

# install 2 pips
pip install --no-cache-dir numpy==1.19.5 cvxpy==1.1.3

# try to load cvxpy
python -c 'import cvxpy'

Output:

RuntimeError: module compiled against API version 0xe but this version of numpy is 0xd
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/local/var/pyenv/versions/pip-issue-9542/lib/python3.8/site-packages/cvxpy/__init__.py", line 18, in <module>
    from cvxpy.atoms import *
  File "/usr/local/var/pyenv/versions/pip-issue-9542/lib/python3.8/site-packages/cvxpy/atoms/__init__.py", line 20, in <module>
    from cvxpy.atoms.geo_mean import geo_mean
  File "/usr/local/var/pyenv/versions/pip-issue-9542/lib/python3.8/site-packages/cvxpy/atoms/geo_mean.py", line 20, in <module>
    from cvxpy.utilities.power_tools import (fracify, decompose, approx_error, lower_bound,
  File "/usr/local/var/pyenv/versions/pip-issue-9542/lib/python3.8/site-packages/cvxpy/utilities/power_tools.py", line 18, in <module>
    from cvxpy.atoms.affine.reshape import reshape
  File "/usr/local/var/pyenv/versions/pip-issue-9542/lib/python3.8/site-packages/cvxpy/atoms/affine/reshape.py", line 18, in <module>
    from cvxpy.atoms.affine.hstack import hstack
  File "/usr/local/var/pyenv/versions/pip-issue-9542/lib/python3.8/site-packages/cvxpy/atoms/affine/hstack.py", line 18, in <module>
    from cvxpy.atoms.affine.affine_atom import AffAtom
  File "/usr/local/var/pyenv/versions/pip-issue-9542/lib/python3.8/site-packages/cvxpy/atoms/affine/affine_atom.py", line 22, in <module>
    from cvxpy.cvxcore.python import canonInterface
  File "/usr/local/var/pyenv/versions/pip-issue-9542/lib/python3.8/site-packages/cvxpy/cvxcore/python/__init__.py", line 3, in <module>
    import _cvxcore
ImportError: numpy.core.multiarray failed to import

The important clue is RuntimeError: module compiled against API version 0xe but this version of numpy is 0xd.

Searching on that can get you to pip issue 9542 and cvxpy issue 1229 which explain what went wrong.

The workarounds in this case are to (a) update to cvxpy>=1.1.10, or (b) update to numpy>=1.20, or (c) update both. You'll have to cope with library changes since the original environment is not reproducible without diving into pip's --no-build-isolation world.

I Had the same error occurring as I was using the numpy version suggested by the requirements.txt in the repo. When I tried to 'import pandas as pd' this error occurred. Then the solution was to upgrade numpy version to 1.15.2 as the version suggested in the requirements was mismatching with pandas. I uninstalled the existing numpy version with pip and reinstalled the new version.

pip install numpy==1.15.2 

Hope this helps someone

Tilde folders

In the event pip uninstall numpy and reinstallation of Numpy does not work. Review your site-packages folder for sub-folders beginning with a tilde ~

These folders relate to pip installations that got mangled and the installation was aborted part way through. The tilde folders were only ever meant to be tmp folders but ended up becoming permanent. In my case there was a file called ~mpy which was a mangled legacy Numpy folder. This led to compatibility issues and ImportErrors.

These mangled folders can safely be deleted, for further details see this answer

I was able to solve the problem by updating my python to 3.8. I am using Macbook Air with Catalina. The problem started for me after updating TensorFlow. After updating it, the error doesn't disappear after I uninstalled and installed numpy several times.

Finally, I downloaded the python3.8 package from python website and installed. Then I installed numpy and it worked.

I got this same error in a conda environment, only six+ years later. The other responses were helpful, and eventually I tracked it down to this problem:

> conda list numpy
# packages in environment at [Anaconda3]:
#
# Name                    Version                   Build  Channel
numpy                     1.14.5                   pypi_0    pypi
numpy-base                1.18.1           py36hc3f5095_1
numpydoc                  0.9.1                    pypi_0    pypi

The problem was that 'numpy' was a different version than 'numpy-base'. I solved this with:

> conda install numpy-base=1.14.5

so the two of them matched each other.

This helped me

sudo pip3 install --upgrade --target=/home/<username>/.local/lib/python3.6/site-packages numpy

For me it was a two part. First:

pip uninstall numpy

Then @Oli Blum answer (thank you):

conda install -c conda-forge numpy

That did the trick for me

uninstall existing numpy and install opencv-python will resolve the issue

Just fixed this issue. import c2 or import numpy was not working. Uninstalled the most current version of numpy. Tried to install numpy==1.15.2 just like specified above, did not work. Tried numpy==1.19.3 IT worked. I guess not all versions work perfectly with all versions of python and dependencies. So keep uninstalling and install one that works.

In case you uninstalled and reinstalled or installed update but it still not work, especially if you're packaging with cx_freeze:

• Try to change your code by import numpy before import cv2.

I was struggling with this error in my Raspberry 4. I was developing a Django backend that used opencv.

What solved my problem was:

sudo pip install numpy==1.23.0

Raspberry info: Linux raspberrypi 5.15.61-v7l+

Python version: 3.9

Hope this helps someone.

Encountered this when trying to import Pytorch. Solved it by uninstalling or removing numpy repeatedly until no version was left on my Ubuntu and installing the newest version. In my case pip encountered Access is denied permission errors all the time maybe because of conflict with conda.

Run sudo pip uninstall numpy. If it refuses to delete the package from a <location> (make sure to make it the location of that specific package, not all packages - this is irreversible), run sudo rm -r <location>. Repeat above until the first command doesn't do anything and import numpy can't find the package within Python shell.

Install numpy using pip.