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I finally worked it out - I ran:

sudo apt-get purge python-ros* python-catkin*

which got rid of the conflicting packages. I then went through the installation process again, but didn't run

sudo apt-get autoremove

after running

rosdep install --from-paths src --ignore-src --rosdistro melodic -y

and no longer had that error. Thanks for all the help!

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