Hello,
I was just testing my websocket, for which I was using the basic ros publisher subscriber tutorial. These worked until last week, and I haven't touched this package until today.
error thrown when i run my script:
rosrun my_package talker.py
the error as follows:
rate = rospy.Rate(10) # 10hz
File "/opt/ros/kinetic/lib/python2.7/dist-packages/rospy/timer.py", line 61, in __init__
self.last_time = rospy.rostime.get_rostime()
File "/opt/ros/kinetic/lib/python2.7/dist-packages/rospy/rospy/rostime.py", line 190, in get_rostime
raise rospy.exceptions.ROSInitException("time is not initialized. Have you called init_node()?")
rospy.rospy.rospy.exceptions.ROSInitException: time is not initialized. Have you called init_node()?
I tried changing the rospy.init() position as in other solutions ( which is kinda naive ) and check indentation. Actually, all of my scripts have started throwing errors. I did a catkin clean and catkin build as well. Also sometimes apt-get update and upgrade breaks; checked those as well. Anyone any pointers, please?
Additionally, after i launched my subscriber node, i dont find the the node name and topic name when I do rosnode list and rostopic list.
Originally posted by arunavanag on ROS Answers with karma: 277 on 2018-02-19
Post score: 1
Original comments
Comment by gvdhoorn on 2018-02-19:\
I tried changing the
rospy.init()position as in other solutions ( which is kinda naive )
that depends. Can you show what the order of statements is that you have now?
Comment by arunavanag on 2018-02-19:
@gvdhoorn it was not the issue with the order of statement. I had copied the publisher tutorial as it is. I used gdb however it did not help out. I tried running any ros kinetic package, everything failed until i realized my ros path, python path and other source paths have broken. I tried fixing
Comment by arunavanag on 2018-02-19:
them from .bashrc and by editing the symlinks. But just had to remove ros-kinetic and reinstall. Things seems to work. ROS comes with its python which is often an issue with ubuntu python. Using other packages like openai, gym, tensorflow, everything gets messed up.
Comment by arunavanag on 2018-02-19:
When i install this python packages, they get installed in python2.7 or python3.5 in /usr/local/lib/python.x.x But then when I try to import rospy and then import these external python packages, the paths get messed. Any suggestions on this? Should I create a new question for this?
Comment by arunavanag on 2018-02-19:
Do I need to take down this question?
Comment by gvdhoorn on 2018-02-19:
Post your comment about your paths being incorrect as an answer. Then accept that.
As to your Python issues: virtualenv is the key here.
ROS comes with its python
no. ROS uses whatever Python2 is distributed by your system, especially on Ubuntu.
Comment by gvdhoorn on 2018-02-19:\
When i install this python packages, they get installed in python2.7 or python3.5
You are in complete control of where things get installed, by using the appropriate pip or python scripts/binaries.
There are multiple questions about this on ROS Answers.
Comment by arunavanag on 2018-02-19:
I have tried using virtualenv. I mostly use pip . Ok I might not be using the right tools, thanks I will have a look.