name 'cv' is not defined

[Gil-W]

Working on a Mac with brew installed utilities and I am getting this error message (from the sample code):
gil$ python foo.py
Traceback (most recent call last):
File "foo.py", line 14, in
inp = cv.LoadImage("source.bmp")
NameError: name 'cv' is not defined

I had a bunch of issues around not having cv at all but seemed to have fixed that with:

brew install homebrew/science/opencv
....
==> Installing opencv
==> Downloading https://downloads.sf.net/project/machomebrew/Bottles/science/ope

################################################################## 100.0%

==> Pouring opencv-2.4.10.1.yosemite.bottle.tar.gz

I could be barking up the wrong tree entirely :-(

[RobinDavid]

Hello. I have never worked on Mac, so I am not really aware of how it is meant to work. Can you import cv from the interactive shell ? "cv" is the old syntax try import cv2, maybe the mac version of opencv got rid of the old syntax. If it doesn't the problem is coming from your installation.

[Buggaboo]

Mac

1. Reinstall brew.

rm -rf /usr/local/Cellar /usr/local/.git && brew cleanup
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

2. Install opencv

brew tap homebrew/science
brew install opencv

3. Add the packages to python

mkdir -p $HOME/Library/Python/2.7/lib/python/site-packages
echo 'import site; site.addsitedir("/usr/local/lib/python2.7/site-packages")' >> $HOME/Library/Python/2.7/lib/python/site-packages/homebrew.pth

[RobinDavid]

Thank you @Buggaboo for this enlightenment 😉