import cv2 error caused by ROS!

kinetic

asked 2018-05-08 12:36:37 -0600

nrb
37 ●4 ●6 ●11

updated 2018-05-08 12:45:03 -0600

I have anaconda installed. which python gives me the following output:

/home/nehal/anaconda3/bin/python

Now when I start python on command line, it starts the anaconda's python but import cv2 gives me the following error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: /opt/ros/kinetic/lib/python2.7/dist-packages/cv2.so: undefined symbol: PyCObject_Type

In the .bashrc I have :

export PATH="/home/nehal/anaconda3/bin:$PATH"
export PYTHONPATH="/home/nehal/anaconda3/lib/python3.6/dist-package‌s:$PYTHONPATH"
ROS_IP=
ROS_HOSTNAME=
ROS_MASTER_URI=
source /opt/ros/kinetic/setup.bash
source ~/catkin_ws/devel/setup.bash

and nothing else related to python in .bashrc

nehal@nehal-Inspiron-5559:~$ echo $PYTHONPATH
/home/nehal/catkin_ws/devel/lib/python2.7/dist-packages:/opt/ros/kinetic/lib/python2.7/dist-packages:/home/nehal/anaconda3/lib/python3.6/site-package‌s:/home/nehal/anaconda3/lib/python3.6/dist-package‌s:/home/nehal/anaconda3/lib/python3.6/dist-package‌s:/home/nehal/anaconda3/lib/python3.6/dist-package‌s:/home/nehal/anaconda3/lib/python3.5/dist-package‌s:/home/userx/anaconda3/lib/python3.5/dist-package‌s:/home/userx/anaconda3/lib/python3.5/dist-package‌s:/home/userx/anaconda3/lib/python3.5/dist-package‌s

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3

answered 2018-05-08 13:21:15 -0600

ahendrix

47576 ●179 ●367 ●662 http://namniart.com/

You're mixing Anaconda (which is apparently Python 3) with python modules that are compiled for cPython 2.7. These are incompatible and won't work together.

You may want to try either:

Don't use Anaconda when you use ROS (use one or the other, but not both)
Recompile ROS and the OpenCV python library to use Anaconda (I have no idea how to do this, but you can probably find instructions online)

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Thank you!

nrb ( 2018-05-08 13:30:11 -0600 )edit

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4

answered 2019-08-27 12:31:06 -0600

lochlomond
61 ●3 ●7 ●9

updated 2019-08-27 16:33:19 -0600

ahendrix

47576 ●179 ●367 ●662 http://namniart.com/

i met the same problem, here is how i "solved" it, ugly but worked

write "import cv2" into

import sys
sys.path.remove('/opt/ros/kinetic/lib/python2.7/dist-packages') # in order to import cv2 under python3
import cv2
sys.path.append('/opt/ros/kinetic/lib/python2.7/dist-packages') # append back in order to import rospy

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Wow! It's working. Thanks a lot!

amiryanj ( 2019-12-24 08:38:17 -0600 )edit

Thanks a lot, it works

pry ( 2020-03-21 05:14:55 -0600 )edit

solved ,thanks

myth1665 ( 2020-05-11 21:35:27 -0600 )edit

this should be an accepted answer though

Farid ( 2020-07-31 06:46:23 -0600 )edit

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0

answered 2019-12-26 06:35:44 -0600

mirchi
31 ●2 ●4

updated 2019-12-27 16:45:24 -0600

jayess
6155 ●26 ●85 ●92

bashrc file

source /opt/ros/kinetic/setup.bash 
export ROS_HOSTNAME=localhost
export ROS_MASTER_URI=http://localhost:11311

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import cv2 error caused by ROS!

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