ursina 引擎如何检测更新 function 是否已声明？

Question

我一直在尝试通过定义来模拟 Ursina 游戏引擎的更新方法

main_game.py

from testengine import *


def update():
    pass


def draw():
    pass


game = game(900, 500, 'Game', 60)
game.run()

__init__.py

import pygame


class game():
    WIN = None
    run = False

def __init__(self, WIDTH, HEIGHT, TITLE, FPS):
    self.WIDTH = WIDTH
    self.HEIGHT = HEIGHT
    self.TITLE = TITLE
    self.FPS = FPS
    WIN = pygame.display.set_mode((self.WIDTH, self.HEIGHT))
    pygame.display.set_caption(TITLE)

def run(self):
    run = True
    clock = pygame.time.Clock()
    global update, draw
    while run:
        clock.tick(self.FPS)
        update()
        draw()

我尝试导入main_game.py但它变成了循环导入。

Answer 1

用这个：

try:
    update
except NameError:
    print("the function update() doesn't exist")
else:
    print("the function update exist")