code: def execute(self):
          
  
          role_name = self._command_args['role_name']
          role_directory = os.getcwd()
          msg = 'Initializing new role {}...'.format(role_name)
          LOG.info(msg)
  
          if os.path.isdir(role_name):
              msg = ('The directory {} exists. '
                     'Cannot create new role.').format(role_name)
              util.sysexit_with_message(msg)
  
          template_directory = ''
          if 'template' in self._command_args.keys():
              template_directory = self._command_args['template']
          else:
              template_directory = 'role'
          self._process_templates(template_directory, self._command_args,
                                  role_directory)
          scenario_base_directory = os.path.join(role_directory, role_name)
          templates = [
              'scenario/driver/{driver_name}'.format(**self._command_args),
              'scenario/verifier/{verifier_name}'.format(**self._command_args),
          ]
          for template in templates:
              self._process_templates(template, self._command_args,
                                      scenario_base_directory)
          self._process_templates('molecule', self._command_args, role_directory)
  
          role_directory = os.path.join(role_directory, role_name)
          msg = 'Initialized role in {} successfully.'.format(role_directory)
          LOG.success(msg)
docs: Execute the actions necessary to perform a `molecule init role` and
          returns None.
  
          :return: None