Show the Spyder tutorial in the Help plugin, opening it if needed

def show_tutorial(self):
        """Show the Spyder tutorial in the Help plugin, opening it if needed"""
        self.switch_to_plugin()
        tutorial_path = get_module_source_path('spyder.plugins.help.utils')
        tutorial = osp.join(tutorial_path, 'tutorial.rst')
        text = open(tutorial).read()
        self.show_rich_text(text, collapse=True)