I am having issues using a custom message. I have the message file in the `/msg` folder, I have adjusted the` CMakeList.txt` and so on too. However, when I run the launch file for my package that uses the custom message, it tells me that the module does not exist. `ImportError: no module named my_package.msg`.
I am trying to import the message into a script in the `src/` directory of the package where the message itself is in the `msg/` directory.
I have also been running source `devel/setup.bash` after every `catkin_make` (Perhaps that is specific to the tutorial I am working through?). Also been running `rospack profile`. Autocompletion works for the named package, but just this import issue that fails. But it gets more interesting...
I found that the custom message was indeed generated by `catkin_make`, and I found it in `/home/user/catkin_ws/devel/lib/python2.7/dist-packages/my_package/msg/`. However, all the files there were preceded with underscores: `_MyMsg.py`, `__init__.py` and their compiled counterparts: `_MyMsg.pyc` and `__init__.pyc`. I managed to import and use the message with the import statement just importing the entire msg module (the final folder in the path above), then I had to use the custom message from that module:
# import entire module
from my_package import msg
# create an object from my custom message type
cust_msg = msg.MyMsg()
If anyone can explain to my what I might be doing wrong, I'd love to know!
Just to mention that I didn't fall into the common trap: the name of my package and the scripts that import the custom message were not the same ;)
I also tried putting `__init__.py` files in the relevant folders to see if not being a module itself was preventing the imports.
Any ideas what I am doing wrong?
There is [a very similar question here](https://answers.ros.org/question/121616/cannot-include-custom-msg-files-in-python-code/) - but as I already mentioned, I am indeed sourcing the `setup.bash` file
# Edit:
I have tested it from another package that I made, and am able to import the custom message without any issues. So it there a problem to import a custom message from within the `src/` folder of the package where the custom message is defined?
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