pkg_resources.DistributionNotFound: The 'catkin-pkg==0.4.9' distribution was not found

pkg_resources.DistributionNotFound: The 'catkin-pkg==0.4.9' distribution was not found

个人感觉是python2与python3在ros中的差异导致的，

问题一：Traceback (most recent call last):  File "/usr/bin/rosdep", line 3, in     from rosdep2.main import rosdep_mainImportError: No module named 'rosdep2'

解决：sudo apt-get install python3-rosdep

问题二：pkg_resources.DistributionNotFound: The 'catkin-pkg==0.4.9' distribution   was not found

解决：

​​pip install catkin-tools​​

​​install rospkg​​

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