python - 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