How can I upgrade NumPy?

Question

When I installed OpenCV using Homebrew (brew), I got this problem whenever I run this command to test python -c "import cv2":

RuntimeError: module compiled against API version 9 but this version of numpy is 6 Traceback (most recent call last):   File "<string>", line 1, in <module> ImportError: numpy.core.multiarray failed to import 

I tried to upgrade NumPy, but this is confusing:

>>> import numpy >>> print numpy.__version__ 1.6.1 

When I run brew to upgrade NumPy, I got this problem:

brew install -u numpy Warning: numpy-1.9.1 already installed 

When I uninstalled it:

sudo pip install numpy Requirement already satisfied (use --upgrade to upgrade): numpy in ./anaconda/lib/python2.7/site-packages 

I have followed this question and deleted Anaconda from my mac.

pip install numpy Requirement already satisfied (use --upgrade to upgrade): numpy in /Library/Python/2.7/site-packages 

But nothing have changed. How can I link the NumPy version to OpenCV?

Answer 1

When you already have an older version of NumPy, use this:

pip install numpy --upgrade 

If it still doesn't work, try:

pip install numpy --upgrade --ignore-installed 

Answer 2

Because we have two NumPy installations in the system. One is installed by Homebrew and the second is installed by pip. So in order to solve the problem, we need to delete one and use the default NumPy install by OpenCV.

Check the path,

import numpy print numpy.__path__ 

and manually delete it using rm.