rospy路径出错

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运行程序时需要import rospy，发现环境中的rospy路径在/dist-packages中，而程序是在/site-packages中找的

(base) xxx@xxx-virtual-machine:~$ 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 rospy
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  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 53, in <module>
    import roslib.stacks  # noqa: F401, I100
  File "/opt/ros/melodic/lib/python2.7/dist-packages/roslib/stacks.py", line 45, in <module>
    import roslib.packages
  File "/opt/ros/melodic/lib/python2.7/dist-packages/roslib/packages.py", line 48, in <module>
    from catkin.find_in_workspaces import find_in_workspaces as catkin_find
  File "/opt/ros/melodic/lib/python2.7/dist-packages/catkin/find_in_workspaces.py", line 39, in <module>
    from catkin_pkg.packages import find_packages
ImportError: cannot import name 'find_packages' from 'catkin_pkg.packages' (/home/xxx/anaconda3/lib/python3.8/site-packages/catkin_pkg/packages.py)
>>>
[1]+  已停止               python
(base) xxx@xxx-virtual-machine:~$ pip install rospy
Requirement already satisfied: rospy in /opt/ros/melodic/lib/python2.7/dist-packages (1.14.13)

通过检索知道：
如果是系统自带的python，会使用dist-packages目录；
如果手动安装python，会直接使用目录site-packages
参考：

https://blog.csdn.net/cc1949/article/details/78286224

请问这种情况应如何解决呢？

小鱼

@1687028512 没太理解你的意思哈，看你的错误时rospy导入时候发生错误，错误原因在catkin_pkg,也尝试降低以下catkin_pkg的版本试试，可能要和rospy匹配。

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@小鱼在 rospy路径出错中说：

@1687028512 没太理解你的意思哈，看你的错误时rospy导入时候发生错误，错误原因在catkin_pkg,也尝试降低以下catkin_pkg的版本试试，可能要和rospy匹配。

尝试降低catkin_pkg版本

pip3 install catkin-pkg==0.4.16

得到

(base) xxx@xxx-virtual-machine:~$ pip3 install catkin-pkg==0.4.16
Collecting catkin-pkg==0.4.16
  Downloading catkin_pkg-0.4.16-py3-none-any.whl (74 kB)
     |████████████████████████████████| 74 kB 311 kB/s
Requirement already satisfied: docutils in /home/xxx/anaconda3/lib/python3.8/site-packages (from catkin-pkg==0.4.16) (0.17.1)
Requirement already satisfied: pyparsing in /home/xxx/anaconda3/lib/python3.8/site-packages (from catkin-pkg==0.4.16) (2.4.7)
Requirement already satisfied: python-dateutil in /home/xxx/anaconda3/lib/python3.8/site-packages (from catkin-pkg==0.4.16) (2.8.1)
Requirement already satisfied: six>=1.5 in /home/xxx/anaconda3/lib/python3.8/site-packages (from python-dateutil->catkin-pkg==0.4.16) (1.15.0)
Installing collected packages: catkin-pkg
  Attempting uninstall: catkin-pkg
    Found existing installation: catkin-pkg 0.4.24
    Uninstalling catkin-pkg-0.4.24:
      Successfully uninstalled catkin-pkg-0.4.24
Successfully installed catkin-pkg-0.4.16

重新执行python命令，报错解决。

参考

https://blog.csdn.net/weixin_41560777/article/details/122744467

非常感谢小鱼的及时解答！上周因为一些事情暂停了项目，没有及时回复，在这里说声抱歉~我又肥来啦~

小鱼

@1687028512