如何为自制模块设置 python 路径？

Question

I ran into trouble while setting up a framework which I have been given. You can see the folder hierarchy of the framework in the pictures below:

The problem is with the imports of the tug_resource_monitor_node.py which you can see in the last image. Imports look like:

import rospy
from tug_resource_monitor.srv import *
import rosnode
import os
import psutil
from tug_resource_monitor.msg import NodeInfo, NodeInfoArray
from std_msgs.msg import Header
from tug_python_utils import YamlHelper as Config

I get the following error message: No module named tug_resource_monitor.srv

I have already tried adding the python module through: sys.path.insert(0, "/home/username/catkin_ws/model_based_diagnosis/") (at the beginning of the tug_resource_monitor_node.py file) I also tried adding the path to .profile by adding the following line:

export PYTHONPATH=$PYTHONPATH:/home/username/catkin_ws/model_based_diagnosis

Unfortunately none of the above worked. Can anybody help me out?

Answer 1

1 try export PYTHONPATH=$PYTHONPATH:/home/username/catkin_ws/model_based_diagnosis/scripts

2 try from tug_resource_monitor import *

Answer 2

Changing import to from model_based_diagnosis.tug_resource_monitor.srv import * will work.

catkin_ws/
└── model_based_diagnosis
    ├── __init__.py
    └── tug_resource_monitor
        ├── scripts
        │   └── tug_resource_monitor_node.py
        └── srv
            ├── __init__.py
            └── test_import.py

~$ pwd
/Users/username/catkin_ws/model_based_diagnosis/tug_resource_monitor/scripts

~$ python tug_resource_monitor_node.py 
import module from srv
Import form  /Users/username/catkin_ws/model_based_diagnosis/tug_resource_monitor/srv/test_import.py

and code I used to test

~$ cat tug_resource_monitor_node.py 
import sys

sys.path.insert(0, "/Users/username/catkin_ws")
from model_based_diagnosis.tug_resource_monitor.srv import test_import
print("import module from srv")
test_import.import_test()