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for python there always show us very friendly error tracking, so if u can show us the all error message , that will very help people re-help you; like :

In [1]: import cv2

In [2]: cv2.findChessboardCorners()

TypeError Traceback (most recent call last) <ipython-input-2-0ea99b6628b2> in <module>() ----> 1 cv2.findChessboardCorners()

TypeError: Required argument 'image' (pos 1) not found ...

and for my guess findEssentialMat is maybe not in cv3 ? compilation - How to enable findEssentialMat in opencv 2.4.9? - Stack Overflow http://stackoverflow.com/questions/15492402/how-to-enable-findessentialmat-in-opencv-2-4-9

BTW: and other possible, not the findEssentialMat error, just u python code error?

E, mask = cv2.findEssentialMat(p1, p0, focal, pp, cv2.RANSAC, 0.999, 1.0); R, t = recoverPose(E, p1, p0, focal, pp, mask);

for this code ,look like not right python code...