Unable to import opencv in Jupyter notebook but able to import in command line on Anaconda

问题

I created a new environment in anaconda for python 3.5 and installed all the required pip libraries including opencv.

If I execute the following in command line

$ python
Python 3.5.2 |Continuum Analytics, Inc.| (default, Jul  2 2016, 17:52:12) 
[GCC 4.2.1 Compatible Apple LLVM 4.2 (clang-425.0.28)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>>

As you can see above there is no issues importing cv2.

However when I open Jupyter notebook and execute the following

#importing some useful packages
import matplotlib.pyplot as plt
import matplotlib.image as mpimg
import numpy as np
import cv2
%matplotlib inline

I get the following error

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)


<ipython-input-5-69f36577ffd4> in <module>()
      3 import matplotlib.image as mpimg
      4 import numpy as np
----> 5 import cv2
      6 get_ipython().magic('matplotlib inline')

ImportError: No module named 'cv2'

I also tried cycling through all the available kernals in Kernal->Change Kernal settings. That didnt help either

回答1:

The following comment by @Destrif fixed it

import sys
sys.path.append('/Users/[username]/Applications/anaconda/envs/UdacityNanoCar/lib/python3.5/site-packages')

If there is more elegant answer I welcome it.

回答2:

I also had this problem. I installed opencv-contrib-python package using pip in my conda env and getting the same error

$ source activate env 
$ pip install opencv-contrib-python

uninstalled opencv from my env and installed when I was not inside env i.e

$ source deactivate (if you are in the env )
$ pip install opencv-contrib-python

来源：https://stackoverflow.com/questions/41248940/unable-to-import-opencv-in-jupyter-notebook-but-able-to-import-in-command-line-o

标签

python

OpenCV

pip

python-3.5