Problem Exercise 2.1 in Linux for Robotics

1

Hi!
I’m new to ROS and started the “Linux for Robotics” free course (sorry didn’t find the category tag).

When trying to complete Exercise 2.1 move_bb8_square.py I get the following error message:

Traceback (most recent call last):
File “/home/user/catkin_ws/src/linux_course_files/move_bb8_pkg/my_scripts/move_bb8_square.py”, line 68, in
movebb8_object.move_square(side=0.6)
TypeError: move_square() got an unexpected keyword argument ‘side’
[INFO] [1567337502.462870, 0.000000]: shutdown time! Stop the robot

I have the following permissions associated to the file:

user:~/catkin_ws/src/linux_course_files/move_bb8_pkg/my_scripts$ ls -latotal 12
drwxr-xr-x 2 user user 4096 Sep 1 11:29 .
drwxr-xr-x 4 user user 4096 Sep 1 10:54 …
-rwxr-xr-x 1 user user 2203 Sep 1 11:28 move_bb8_square.py

Any help on how to solve this is highly appreaciated.

Thanks!

2

Hi again!

I edited the code of the “move_bb8_square.py” changing the value in line 68 of the parameter (side=0.6) to a simple number, 10 for instance.

movebb8_object.move_square(10)

I don’t know if this is correct but it seems to work fine for this example.

Ciao!

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3

how is the move_square() function defined? The error says that it doesnt expect the ‘side’ keyword. So it most likely that the expected parameter is called differently. This gives you two choices:

  1. name it correctly
  2. leave it out and call it like that:
movebb8_object.move_square(0.6)
3 Likes
4

Thanks!
That’s what I did :blush:

1 Like