code: def execute(self):
          
          scenario_name = self._command_args['scenario_name']
          role_name = os.getcwd().split(os.sep)[-1]
          role_directory = util.abs_path(os.path.join(os.getcwd(), os.pardir))
  
          msg = 'Initializing new scenario {}...'.format(scenario_name)
          LOG.info(msg)
          molecule_directory = config.molecule_directory(
              os.path.join(role_directory, role_name))
          scenario_directory = os.path.join(molecule_directory, scenario_name)
          scenario_base_directory = os.path.dirname(scenario_directory)
  
          if os.path.isdir(scenario_directory):
              msg = ('The directory molecule/{} exists. '
                     'Cannot create new scenario.').format(scenario_name)
              util.sysexit_with_message(msg)
  
          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 scenario in {} successfully.'.format(
              scenario_directory)
          LOG.success(msg)
docs: Execute the actions necessary to perform a `molecule init scenario` and
          returns None.
  
          :return: None