Show sys.path contents.

def show_syspath(self, syspath):
        """Show sys.path contents."""
        if syspath is not None:
            editor = CollectionsEditor(self)
            editor.setup(syspath, title="sys.path contents", readonly=True,
                         width=600, icon=ima.icon('syspath'))
            self.dialog_manager.show(editor)
        else:
            return