How to solve the problem of the python dependencies?

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This looks like a bug in the way the debs are generated for Debian. I've reported it here

In the meantime, you should be able to install the required python packages through PIP:

sudo pip install -U rosdep rosinstall_generator wstool rosinstall

NOTE: installing through PIP is a TEMPORARY WORKAROUND until this bug is fixed upstream. You will not get updates, and packages installed through PIP are generally more difficult to remove than their deb counterparts.

rosdep may not detect packages that have been installed through pip, and you may have to mark them as manually installed.

I am having the same issue using the hydro installation on Debian instructions from this site. When I perform the 0.1 Prerequisites step where the apt-get install python-wstool fails with the same error. Is there a way to fix this dependency error so I can move on to step one from the wiki installation instructions?

Looks like you are trying to install Ubuntu packages in Debian. Please update your question with which instructions you are following and provide the exact commands you are running including the output of those commands.