运行Python turtle/pyw代码时海龟对象不显示的问题求助

这不是电脑环境问题，完全是代码本身的逻辑错误导致的，具体问题和修复方案如下：

核心错误点 #

• 最致命的问题：你在所有海龟对象初始化代码的前面加了while True:死循环，程序启动后会一直卡在这个死循环里反复定义函数，永远执行不到后面创建player、dragon海龟实例的代码，自然不会有任何海龟显示。
• 战斗逻辑语法错误：fight函数中你写了player -= damage_dealt，player是海龟对象，不能直接做数值减法，这里应该是修改玩家血量变量ph -= damage_dealt。
• 变量未定义错误：第二个主循环while ph >=0 and dh>=0执行时，ph和dh还没有被定义，程序运行到这里会直接报错终止。
• 按键绑定适配问题：你绑定的是大写的W/A/S/D，实际运行时需要开启大写锁定才能触发按键操作，建议改成小写或者同时绑定大小写。

修复后的参考代码 #

from turtle import *
import random
player_win = 0
dragon_win = 0
player_level = 0
player_xp = 0
# 提前初始化血量变量
ph = 500
dh = 500

# 函数直接定义在全局，不要放在死循环里
def forward():
    global player
    player.forward(20)
def backward():
    global player
    player.backward(20)
def left():
    global player
    player.left(20)
def right():
    global player
    player.right(20)
def fight():
    global player, dragon, ph, dh, player_xp, player_level
    print("You have encountered a wild dragon!")
    fight_yes_or_no = input("Do you want to fight this dragon??")
    if fight_yes_or_no == "yes":
        ph = 500
        dh = 500
        while ph > 0 and dh > 0:
            if dh > 0:
                print("Dragon attacks!")
                damage_dealt = random.randint(0, 50)
                print("Dragon caused", damage_dealt, "damage")
                # 修正血量操作对象
                ph -= damage_dealt
            if ph > 0:
                print("Player attacks!")
                damage_dealt = random.randint(0, 50)
                print("Player caused", damage_dealt, "damage")
                dh -= damage_dealt
            if dh == 0:
                print("Player wins!")
                print("You have earned 20 xp!")
                player_xp +=20
                if player_xp >= 100:
                    player_level +=1
                    player_xp = player_xp - 100
                    print("You have reached level", player_level)
                break
            if ph == 0:
                print("dragon wins!")
                print("You have lost 20 xp!")
                player_xp -=20
                if player_xp < 0:
                    player_xp = 0
                if player_level > 0 and player_xp == 0:
                    player_level -=1
                    print("You have reached level", player_level)
                if player_level <= 0:
                    print("You died!")
                    quit()
                break
        
    if fight_yes_or_no == "no":
        print("Ok")

# 初始化海龟和窗口逻辑
player = Turtle()
player.home()
screen = Screen()
player.penup()
player.speed(0)
# 绑定小写按键，更符合使用习惯
screen.onkey(forward, "w")
screen.onkey(backward, "s")
screen.onkey(left, "a")
screen.onkey(right, "d")
screen.listen()
dragon = Turtle()
dragon.shape("turtle")
dragon.penup()
dragon.goto(30, 40)
dragon.speed(0)

# 游戏主循环
while True:
    if player.distance(dragon) < 20:
        fight()
        # 战斗结束后把龙移到随机位置避免反复触发战斗
        dragon.goto(random.randint(-200,200), random.randint(-200,200))
    # 保持turtle窗口响应
    screen.update()

内容的提问来源于stack exchange，提问作者Keanan Chiu