No module named '_tf' error when doing "writing a tf broadcaster (py) tutorial

asked 2016-12-09 00:13:51 -0500

Chamikajp
1 ●1 ●1 ●1

updated 2016-12-09 07:38:59 -0500

Hi all Below is the error I'm getting when I try to launch the launch file using the command roslaunch learning_tf start_demo.launch

File "/home/cj/catkin_ws/src/learning_tf/nodes/turtle_tf_broadcaster.py", line 6, in <module> 
import tf
  File "/opt/ros/indigo/lib/python2.7/site-packages/tf/__init__.py", line 28, in <module>

    from _tf import *
ImportError: No module named '_tf'

I tried updating using pacman -Syu and tried reinstalling the "tf" package but the result is the same.

I'm still a beginner and appreciate if someone can help me to correct this error.

PS.
I followed the steps given in this tutorial

This error occurs when I try to do the roslaunch learning_tf start_demo.launch step.

answered 2016-12-09 01:59:23 -0500

mgruhler

12390 ●32 ●193 ●173 https://github.com/mgruhler

updated 2016-12-09 01:59:56 -0500

The problem is the leading underscore before tf in the import. Remove this and you should be good to go. But updating/reinstalling tf will not change this. The problem is in the learning_tf repo.

Where did you get this demo from? Did you clone from github or did you copy'n'paste stuff or did you change anything?

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If it is this) demo, then I think it's a simple copy-paste error, as there is no underscore before tf in the example.

gvdhoorn ( 2016-12-09 05:02:59 -0500 )edit

Thank you very much for your replays.. This is the tutorial part I was following . The file in the learning_tf repo contains the import tf problem is with the __init__.py file..

Chamikajp ( 2016-12-09 06:43:20 -0500 )edit

It contains the from _tf import * .. I'll try editing the __init__.py file and get back to you..

Chamikajp ( 2016-12-09 06:43:33 -0500 )edit

But which "repo" are you talking about specifically?

gvdhoorn ( 2016-12-09 07:04:09 -0500 )edit

Sorry if my comment is confusing. I meant the learning_tf folder which has the file containing the import tf code.. I exactly followed the steps given in the tutorial. Error is generated by this file /opt/ros/indigo/lib/python2.7/site-packages/tf/__init__.py"

Chamikajp ( 2016-12-09 07:38:57 -0500 )edit

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