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rosdep install --from-paths . --simulate -v

Is the --simulate just there for testing, or are you actually trying to install things using that line? From the rosdep install help:

 -s, --simulate        Simulate install

So it won't actually install anything, but only print out what it would do without --simulate.

Remove that option and try again.

rosdep install --from-paths . --simulate -v

Is the --simulate just there for testing, or are you actually trying to install things using that line? From the rosdep install help:

 -s, --simulate        Simulate install

So it won't actually install anything, but only print out what it would do without --simulate.

Remove that option and try again.

rosdep install --from-paths . --simulate -v

Is the --simulate just there for testing, or are you actually trying to install things using that line? From the rosdep install help:

 -s, --simulate        Simulate install

So it won't actually install anything, but only print out what it would do without --simulate.

Remove that option and try again.

Edit:

Sorry for the confusion, the error is the same without --simulate, I removed it from the question.

I cannot reproduce this on a Precise/Hydro installation with a skeleton pkg that contained just a manifest with a <run_depend>python-fysom</run_depend> in it. Running rosdep install .. on the workspace resulted in pip being invoked, and python-fysom being installed.

Can you try to reinitialise the rosdep cache using rosdep update and then try again?

In all cases: please update your question with information on your Linux and ROS distribution (name, version), as well as perhaps the pkg that you are running rosdep against.