程序运行报错：module 'rospkg' has no attribute 'RosPack'

[1687028512]

@小鱼 在 程序运行报错：module 'rospkg' has no attribute 'RosPack' 中说：

上下文是否有ROS

运行了这两个命令，得到的结果如下

xxx@xxx-virtual-machine:~$ python3 -c "import sys; print('\n'.join(sys.path))"

/opt/ros/melodic/lib/python2.7/dist-packages
/usr/lib/python36.zip
/usr/lib/python3.6
/usr/lib/python3.6/lib-dynload
/usr/local/lib/python3.6/dist-packages
/usr/lib/python3/dist-packages

xxx@xxx-virtual-machine:~$ python2 -c "import sys; print('\n'.join(sys.path))"

/opt/ros/melodic/lib/python2.7/dist-packages
/usr/lib/python2.7
/usr/lib/python2.7/plat-x86_64-linux-gnu
/usr/lib/python2.7/lib-tk
/usr/lib/python2.7/lib-old
/usr/lib/python2.7/lib-dynload
/usr/local/lib/python2.7/dist-packages
/usr/lib/python2.7/dist-packages
/usr/lib/python2.7/dist-packages/wx-3.0-gtk3

从这两条结果的第一行看起来是有ROS的样子

[小鱼]

@1687028512 虽然有ROS，但是没有发现conda的环境，比较奇怪。再试试Python的

python -c "import sys; print('\n'.join(sys.path))"

[1687028512]

另，可能我给的报错信息还不够完善，在此补充一下

(base)xxx@xxx-virtual-machine:~/catkin_ws/src/scripts$ python run.py
Traceback (most recent call last):
  File "run.py", line 6, in <module>
    import rospy
  File "/opt/ros/melodic/lib/python2.7/dist-packages/rospy/__init__.py", line 49, in <module>
    from .client import spin, myargv, init_node, \
  File "/opt/ros/melodic/lib/python2.7/dist-packages/rospy/client.py", line 52, in <module>
    import roslib
  File "/opt/ros/melodic/lib/python2.7/dist-packages/roslib/__init__.py", line 50, in <module>
    from roslib.launcher import load_manifest  # noqa: F401
  File "/opt/ros/melodic/lib/python2.7/dist-packages/roslib/launcher.py", line 48, in <module>
    _rospack = rospkg.RosPack()
AttributeError: module 'rospkg' has no attribute 'RosPack'

[小鱼]

@1687028512 试一下手动import看看是否有对应的包

Python 3.8.10 (default, Mar 15 2022, 12:22:08) 
[GCC 9.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import rospkg
>>> dir(rospkg)
['InvalidManifest', 'MANIFEST_FILE', 'Manifest', 'ResourceNotFound', 'RosPack', 'RosStack', 'STACK_FILE', '__all__', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__path__', '__spec__', '__version__', 'common', 'environment', 'expand_to_packages', 'get_etc_ros_dir', 'get_log_dir', 'get_package_name', 'get_ros_home', 'get_ros_package_path', 'get_ros_paths', 'get_ros_root', 'get_stack_version_by_dir', 'get_test_results_dir', 'list_by_path', 'manifest', 'on_ros_path', 'parse_manifest_file', 'rospack', 'stack']
>>> rospkg.RosPack()
<rospkg.rospack.RosPack object at 0x7f8c369d0b20>

[1687028512]

@小鱼 在 程序运行报错：module 'rospkg' has no attribute 'RosPack' 中说：

@1687028512 虽然有ROS，但是没有发现conda的环境，比较奇怪。再试试Python的

python -c "import sys; print('\n'.join(sys.path))"

运行结果如下

(base) xxx@xxx-virtual-machine:~/catkin_ws/src/scripts$ python -c "import sys; print('\n'.join(sys.path))"

/opt/ros/melodic/lib/python2.7/dist-packages
/home/xxx/anaconda3/lib/python38.zip
/home/xxx/anaconda3/lib/python3.8
/home/xxx/anaconda3/lib/python3.8/lib-dynload
/home/xxx/anaconda3/lib/python3.8/site-packages
/home/xxx/anaconda3/lib/python3.8/site-packages/locket-0.2.1-py3.8.egg

[小鱼]

@小鱼 在 程序运行报错：module 'rospkg' has no attribute 'RosPack' 中说：

@1687028512 试一下手动import看看是否有对应的包

Python 3.8.10 (default, Mar 15 2022, 12:22:08) 
[GCC 9.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import rospkg
>>> dir(rospkg)
['InvalidManifest', 'MANIFEST_FILE', 'Manifest', 'ResourceNotFound', 'RosPack', 'RosStack', 'STACK_FILE', '__all__', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__path__', '__spec__', '__version__', 'common', 'environment', 'expand_to_packages', 'get_etc_ros_dir', 'get_log_dir', 'get_package_name', 'get_ros_home', 'get_ros_package_path', 'get_ros_paths', 'get_ros_root', 'get_stack_version_by_dir', 'get_test_results_dir', 'list_by_path', 'manifest', 'on_ros_path', 'parse_manifest_file', 'rospack', 'stack']
>>> rospkg.RosPack()
<rospkg.rospack.RosPack object at 0x7f8c369d0b20>

收到，试试这个

[1687028512]

@小鱼 在 程序运行报错：module 'rospkg' has no attribute 'RosPack' 中说：

@1687028512 试一下手动import看看是否有对应的包

Python 3.8.10 (default, Mar 15 2022, 12:22:08) 
[GCC 9.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import rospkg
>>> dir(rospkg)
['InvalidManifest', 'MANIFEST_FILE', 'Manifest', 'ResourceNotFound', 'RosPack', 'RosStack', 'STACK_FILE', '__all__', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__path__', '__spec__', '__version__', 'common', 'environment', 'expand_to_packages', 'get_etc_ros_dir', 'get_log_dir', 'get_package_name', 'get_ros_home', 'get_ros_package_path', 'get_ros_paths', 'get_ros_root', 'get_stack_version_by_dir', 'get_test_results_dir', 'list_by_path', 'manifest', 'on_ros_path', 'parse_manifest_file', 'rospack', 'stack']
>>> rospkg.RosPack()
<rospkg.rospack.RosPack object at 0x7f8c369d0b20>

运行结果如下

(base) xxx@xxx-virtual-machine:~/catkin_ws/src/scripts$ python
Python 3.8.8 (default, Apr 13 2021, 19:58:26)
[GCC 7.3.0] :: Anaconda, Inc. on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import rospkg
>>> dir(rospkg)
['__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__path__', '__spec__']
>>> ropkg.RosPack()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'ropkg' is not defined

[小鱼]

@1687028512 rospkg,不是ropkg，少了个s

[1687028512]

@小鱼 在 程序运行报错：module 'rospkg' has no attribute 'RosPack' 中说：

@1687028512 rospkg,不是ropkg，少了个s

修改后如下

>>> rospkg.RosPack()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'rospkg'  has no attribute 'RosPack'

[小鱼]

@1687028512 在 程序运行报错：module 'rospkg' has no attribute 'RosPack' 中说：

dir(rospkg)
['builtins', 'cached', 'doc', 'file', 'loader', 'name', 'package', 'path', 'spec']

通过这一行可以看出来你的rospkg是空的，有两个办法。

1. 看rospkg源码，看看为何为空
2. 尝试降低rospkg版本或同时降低python版本
   建议先尝试方案2,比较快

[1687028512]

@小鱼 在 程序运行报错：module 'rospkg' has no attribute 'RosPack' 中说：

@1687028512 在 程序运行报错：module 'rospkg' has no attribute 'RosPack' 中说：

dir(rospkg)
['builtins', 'cached', 'doc', 'file', 'loader', 'name', 'package', 'path', 'spec']

通过这一行可以看出来你的rospkg是空的，有两个办法。

1. 看rospkg源码，看看为何为空
2. 尝试降低rospkg版本或同时降低python版本
   建议先尝试方案2,比较快

使用第二个方法，降低rospkg版本
1、卸载现版本rospkg

 pip uninstall rospkg

2、安装低版本rospkg

pip install rospkg==1.2.9

至于装哪个版本，我参考的是这里，显示非testing状态的版本

https://tracker.debian.org/pkg/ros-rospkg/news/?page=1

3、测试

(base) xxx@xxx-virtual-machine:~/catkin_ws/src/scripts$ python
Python 3.8.8 (default, Apr 13 2021, 19:58:26)
[GCC 7.3.0] :: Anaconda, Inc. on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import rospkg
>>> rospkg.RosPack()
<rospkg.rospack.RosPack object at 0x7f1a11689d60>

问题解决，谢谢小鱼的极速且耐心的回复！这对初学者真的非常有帮助，非常感谢！

[小鱼]

@1687028512 客气啦，没事常来社区看看，互相帮助，共同提高~

[1687028512]

@小鱼 一定一定~