无法在 OSX 的 python 中导入 cv2

Question

I have installed OpenCV 3.1 in my Mac, cv2 is also installed through pip install cv2 .

vinllen@ $ pip install cv2
You are using pip version 7.1.0, however version 7.1.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Requirement already satisfied (use --upgrade to upgrade): cv2 in /usr/local/lib/python2.7/site-packages

But it looks like cv2 and cv cannot be used:

Python 2.7.10 (default, Jul 13 2015, 12:05:58)
[GCC 4.2.1 Compatible Apple LLVM 6.1.0 (clang-602.0.53)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named cv2
>>> import cv
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named cv

I have tried almost all the solutions list online, but cannot work.

Answer 1

You can install by

pip install opencv-python

Answer 2

I do not know what pip install cv2 actually installs... but is surely not OpenCV. pip install cv2 actually installs this , which are some blog distribution utilities , not sure what it is, but it is not OpenCV.

---

To properly install OpenCV, check any of the links @udit043 added in the comment, or refer to any of the tutorials bellow:

Find here a tutorial on how to install OpenCV on OS X: http://www.pyimagesearch.com/2015/06/15/install-opencv-3-0-and-python-2-7-on-osx/

You need to actually compile OpenCV from source and activate python bindings, which takes a while.

Another option is to use brew to get OpenCV, but doesn't neccesarilly get you the last version nor a fully optimized one:

https://web.archive.org/web/20171218032016/http://www.mobileway.net/2015/02/14/install-opencv-for-python-on-mac-os-x/

Answer 3

I used conda install opencv and it installed fine for me.

You might want to try this if you are using Anaconda.

Answer 4

For me installation using conda didn't worked. While installing it using pip worked:

pip install opencv-python

os: macos Catalina

Answer 5

Make sure that numpy, other dependency is installed prior installing OpenCV
Also if you installed using PIP then check the installed packages using

pip freeze

Answer 6

You can install by

conda install -c https://conda.binstar.org/menpo opencv

Answer 7

I had the same problem; here's what worked for me: conda install -c conda-forge nb_conda

If you haven't already, do the following to get conda up and running on OS X (taken from docs ):

1. Download Miniconda
2. Download Anaconda
3. Locate to the director that contains the Miniconda file and run bash Miniconda3-latest-MacOSX-x86_64.sh in Terminal
4. Follow the prompts to install Anaconda
5. Run conda install -c conda-forge nb_conda

You could also try conda install -c conda-forge opencv and conda install -c conda-forge/label/broken opencv if step 5 doesn't work, as someone recommended when I had the same problem. Hope this helps!

Answer 8

pip is renamed to pip3 so please use

pip3 install opencv-python