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The documentation for mux says to use mux:=asdf. I just created a launch file with <node name="asdf" pkg="topic_tools

The documentation for mux says to use mux:=foo. I just created a launch file with <node name="asdf" pkg="topic_tools"

Topic remapping in launch.xml is not working for topic_tools/mux node The documentation for topic_tools/mux says: IM

Topic remapping in launch.xml is not working for topic_tools/mux node The documentation for topic_tools/mux says: IM

In my shell I first activate a Python virtual environment and then the Catkin workspace which results in this sys.path, which searches for Python modules in this order.

[
    '/home/user/project/devel/lib/python3/dist-packages',
    '/opt/ros/noetic/lib/python3/dist-packages',
    '/home/user/project/.venv/lib/python37.zip',
    '/home/user/project/.venv/lib/python3.7',
    '/home/user/project/.venv/lib/python3.7/lib-dynload',
    '/usr/lib/python3.7',
    '/home/user/project/.venv/lib/python3.7/site-packages',
    '/home/user/.local/lib/python3.7/site-packages',
    '/usr/local/lib/python3.7/dist-packages',
    '/usr/lib/python3/dist-packages'
]

Yet when I run roslaunch from this shell, which in turn executes a Python node, this is the sys.path it sees. My virtual environment is no longer active.

[
    '/home/user/project/src/pkg/src',
    '/home/user/project/devel/.private/pkg/lib/pkg',
    '/home/user/project/devel/lib/python3/dist-packages',
    '/opt/ros/noetic/lib/python3/dist-packages',
    '/usr/lib/python37.zip',
    '/usr/lib/python3.7',
    '/usr/lib/python3.7/lib-dynload',
    '/home/user/.local/lib/python3.7/site-packages',
    '/usr/local/lib/python3.7/dist-packages',
    '/usr/lib/python3/dist-packages'
]

I would expect it to add the first two entries (so that the ROS package's own Python modules take priority), but keep the rest which include my .venv directories.

Basically, my nodes were being launched with a different python3 executable than I expected. This is because roslaunch

When roslaunch calls execve() to run my node, it is executing (via some symlinks) /home/user/project/devel/.private/pkg/

It appears that it is due to the Python interpreter /usr/bin/python3 being executed instead of /home/user/project/.venv/

What controls the Python search path, and how? In my shell I first activate a Python virtual environment and then the Ca

I installed ROS Noetic on a Debian Buster system, which is listed as a supported platform.

However, I cannot install packages (like python3-catkin-tools) that depend on the python3-osrf-pycommon package because it requires Python 3.8, and Buster provides Python 3.7.

$ sudo apt install -s -o Debug::pkgDepCache::AutoInstall=true python3-catkin-tools
Reading package lists... Done
Building dependency tree       
Reading state information... Done
  Installing python3-osrf-pycommon as Depends of python3-catkin-tools
    python3-osrf-pycommon:amd64 Depends on python3:any:any < none @un H > (>= 3.8~) can't be satisfied!

Though python3-osrf-pycommon is listed on the package index as not being supported on Noetic...

Until this bug is resolved it should be possible to do: wget http://packages.ros.org/ros/ubuntu/pool/main/p/python3-osr

I think this was a regression introduced in this pull request and hopefully it can be resolved by publishing the right p

Cannot install catkin-tools on Debian buster due to Python version requirement I installed ROS Noetic on a Debian Buster

Cannot install catkin-tools on Debian buster due to Python version requirement I installed ROS Noetic on a Debian Buster

I'm writing a Python script to synthesize a rosbag from data files generated outside of ROS.

It would be easiest to be able to define the ROS message types within my Python code, rather than have to write standalone .msg definition files and re-generate them over and over again as I iterate on the script.

What would this entail? I'm fine with importing from genmsg or genpy.

from genpy.dynamic import generate_dynamic msgs = generate_dynamic('pkg/Msg', 'string data\n') Here msgs is a dictiona

Defining message types directly in Python I'm writing a Python script to synthesize a rosbag from data files generated o

Defining message types directly in Python I'm writing a Python script to synthesize a rosbag from data files generated o