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rosdep will attempt to install whatever dependency is declared in the package.xml files for the packages that you are asking it to resolve.

In this case I believe that you're using a package that declares an explicit dependency on the rosdep key python-sphinx

You are either using the wrong branch for that package or it has not yet been updated to support a python3 version of the rosdep, python3-sphinx

If the package has not been updated yet a pull request to help the packages at issue migrate to be Python 3 compatible would I'm sure be appreciated. There's a guide here: http://wiki.ros.org/UsingPython3