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Editorial Team
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Asked: 2026-05-27T14:55:43+00:00

When trying to import cv in python I get: ImportError: No module named cv.

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When trying to “import cv” in python I get: “ImportError: No module named cv”. This question has appeared in many forms, but I haven’t found the answer that helps.

On my Mac OS X Lion, among many other ports, I have run:

sudo port install python27

and

sudo port install opencv +python27

Running:

port select python

I see: “python27 (active)”

And running: 

port installed opencv

I see: “opencv @2.3.1a_1+python27 (active)”

What else should I check? Thanks.

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1 Answer

  1. Editorial Team

    I had this same problem. It looks like a (maybe?) bug with the OpenCV install script for 2.3.1a. It will not create the Python bindings unless NumPy is already installed.

    To fix it:

    sudo port uninstall opencv
sudo port install py27-numpy
sudo port install opencv +python27

    That worked for me! I found this by doing some Googling, and the correct answer was here:
    wbarczynski.org/wp/2011/11/25/opencv-with-py-bindings-on-mac-with-macports-intall-numpy-first/

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