[Python] Error import cv2 : ImportError: numpy.core.multiarray failed to import

I'm new to Ubuntu and I'm trying to use OpenCV module within Jupyter Notebook.

I have a message error when I run:

import cv2


The message error is:

---------------------------------------------------------------------------
RuntimeError Traceback (most recent call last)
RuntimeError: module compiled against API version a but this version of numpy is 9

---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
<ipython-input-20-72fbbcfe2587> in <module>()
----> 1 import cv2

ImportError: numpy.core.multiarray failed to import


I have read a few similar issues from other users on stackoverflow. This issue often comes from a wrong numpy version. I checked and I use numpy 1.9.2:

numpy.version.version
Out[22]:'1.9.2'


From what I understand from other posts, versions 1.8 and above should be enough. Has anyone any idea of what might be wrong?

For information, my version of Python/Anaconda is

print sys.version
2.7.10 |Anaconda 2.3.0 (64-bit)| (default, Sep 15 2015, 14:50:01)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-1)]


Thanks for any help on this matter!

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