RUN项目《玛丽冒险》的窗体py代码时，显示：

    if _name_ == '_main_':

NameError: name '_name_' is not defined

代码如下：

import pygame

from pygame.locals import *

import sys

SCREENW = 822

SCREENH = 199

FPS = 30

def mainGame():

    score = 0

    over = False

    global SCREEN, FPSCLOCK

    pygame.init()

    FPSCLOCK = pygame.time.Clock()

    SCREEN = pygame.display.set_mode((SCREENWIDTH, SCREENHEIGHT))

    pygame.display.set_caption('marie')

    while True:

        # 单机事件

        for event in pygame.event.get():

            if event.type == QUIT:

                pygame.quit()

                sys.exit()

        pygame.display.update()

        FPSCIOCK.tick(FPS)

if _name_ == '_main_':

    mainGame()