PyCapsule_Import could not import module "pyexpat" When running rosdep update

asked 2016-02-29 05:57:16 -0500

dgyx
16 ●1 ●2 ●2

updated 2016-02-29 07:14:55 -0500

ros version:indigo system version:Ubuntu 14.04.4 LTS

I have some problems when running

rosdep update

the error msg as follow

 dgyx@dgyx-pc:~$ rosdep update
Traceback (most recent call last):
  File "/usr/bin/rosdep", line 3, in <module>
    from rosdep2.main import rosdep_main
  File "/usr/lib/python2.7/dist-packages/rosdep2/__init__.py", line 40, in <module>
    from .installers import InstallerContext, Installer, \
  File "/usr/lib/python2.7/dist-packages/rosdep2/installers.py", line 35, in <module>
    from rospkg.os_detect import OsDetect
  File "/usr/lib/python2.7/dist-packages/rospkg/__init__.py", line 43, in <module>
    from .rospack import RosPack, RosStack, \
  File "/usr/lib/python2.7/dist-packages/rospkg/rospack.py", line 35, in <module>
    from xml.etree.cElementTree import ElementTree
  File "/usr/lib/python2.7/xml/etree/cElementTree.py", line 3, in <module>
    from _elementtree import *
ImportError: PyCapsule_Import could not import module "pyexpat"

then i do

dgyx@dgyx-pc:/$ sudo find . -name pyexpat*
[sudo] password for dgyx: 
./usr/lib/python2.7/lib-dynload/pyexpat.x86_64-linux-gnu.so
./usr/include/python2.7/pyexpat.h

Any help is much appreciated.

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answered 2016-03-21 21:51:57 -0500

KelvinLiu
1

updated 2016-03-22 04:11:21 -0500

gvdhoorn
86574 ●283 ●1432 ●1054 http://cor.tudelft.nl/

Thank for @dgyx's solution. I also have this problem when I run the roscore command after I have installed Matlab MCR on my Ubuntu 1404 32bit system.

Traceback (most recent call last):
  File "/opt/ros/indigo/bin/roscore", line 69, in <module>
    import roslaunch
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/__init__.py", line 48, in <module>
    import rospkg
  File "/usr/lib/python2.7/dist-packages/rospkg/__init__.py", line 43, in <module>
    from .rospack import RosPack, RosStack, \
  File "/usr/lib/python2.7/dist-packages/rospkg/rospack.py", line 35, in <module>
    from xml.etree.cElementTree import ElementTree
  File "/usr/lib/python2.7/xml/etree/cElementTree.py", line 3, in <module>
    from _elementtree import *
ImportError: PyCapsule_Import could not import module "pyexpat"

I add the library path of my system - /lib/i386-linux-gnu - in $LD_LIBRARY_PATH in front of Matlab's lib paths. Then the problem is solved. By the way, only adding system library path in front of Matlab's paths works.

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answered 2016-02-29 07:14:06 -0500

dgyx
16 ●1 ●2 ●2

I had solved this problem by

dgyx@dgyx-pc:~/catkin_ws$ ldd /usr/lib/python2.7/lib-dynload/pyexpat.x86_64-linux-gnu.so 
    linux-vdso.so.1 =>  (0x00007fffa4570000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f3ff57dc000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f3ff5416000)
    libexpat.so.1 => /opt/oracle/product/11.2.0/dbhome_1/lib/libexpat.so.1 (0x00007f3ff52e5000)
    /lib64/ld-linux-x86-64.so.2 (0x00005645018a1000)

cd /opt/oracle/product/11.2.0/dbhome_1/lib
sudo mv libexpat.so.1 libexpat.so.1.bak

I think I should edit the LD_LIBRARY_PATH environment.

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PyCapsule_Import could not import module "pyexpat" When running rosdep update

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