diff --git a/.gitignore b/.gitignore
index 6955cf9..2ab5adf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
-__pycache__/
-idea.km
+__pycache__/
+idea.km
 idea.png
\ No newline at end of file
diff --git a/ai.py b/ai.py
new file mode 100644
index 0000000..8e8d8ac
--- /dev/null
+++ b/ai.py
@@ -0,0 +1,84 @@
+from data_structure import Tree
+
+class Ai:
+    def __init__(self):
+        self.path = []
+    
+    def start(self,snake,apple,settings):
+        openlist = []
+        closelist = []
+        starting_point = snake.coords[0]
+        ending_point = apple.coords
+
+
+        def calculate_f():
+            """计算openlist各格子的f值"""
+            for cell in openlist:
+                g = abs(cell['x'] - starting_point['x']) + abs(cell['y'] - starting_point['y'])
+                h = abs(cell['x'] - ending_point['x']) + abs(cell['y'] - ending_point['y'])
+                f = g + h
+                cell['f'] = f
+
+        
+        def is_wall():
+            # 碰到左右墙壁
+            if (cell['x'] == -1 or cell['x'] == settings.cell_w):
+                return True
+            # 碰到上下墙壁
+            if (cell['y'] == -1 or cell['y'] == settings.cell_h):
+                return True
+            # 碰到自己
+            if (cell in snake.coords[1:]):
+                return True
+            return False
+        
+
+        #记得做openlist用尽、苹果在蛇里面的解决办法
+        while ending_point not in openlist:
+            if not openlist:
+                openlist.append(starting_point)
+                path_tree = Tree(starting_point)
+            #查找Openlist中F最小的格子并弹入Closelist
+            #《这里也有问题 假设下面出现的列表同步更改的错误解决了》
+            #《那么本来就被计算过的格子不需要再次计算 但这里依然算了》
+            calculate_f()
+            min_f = min(f['f'] for f in openlist)
+            for cell in openlist:
+                if cell['f'] == min_f:
+                    closelist.append(cell)
+                    openlist.remove(cell)
+                    break
+            #《这里有问题 不应该for 应该只检查刚丢进closelist的那一个》
+            #《检查过的格子又检查一遍 也是openlist有重复格子的根本原因》
+            for close_cell in closelist:
+                near_cells = [{'x': close_cell['x'], 'y': close_cell['y'] + 1},   #获取旁边的格子上右下左
+                            {'x': close_cell['x'] + 1, 'y': close_cell['y']},
+                            {'x': close_cell['x'], 'y': close_cell['y'] - 1},
+                            {'x': close_cell['x'] - 1, 'y': close_cell['y']}]
+                #不考虑蛇的身体或墙壁
+                for cell in near_cells:
+                    if is_wall():
+                        near_cells.remove(cell)
+                #排除F键值对的影响
+                #《？为什么使用切片后copy的更改还是能影响到原openlist？》
+                #《搞得我openlist的f值全弹出了》
+                openlist_copy = openlist[:]
+                for cell_copy in openlist_copy:
+                    cell_copy.pop('f',None)
+                #找出不在openlist的格子并加进openlist
+                #《filter疑似用错 没有筛选功能 openlist依然有重复格子》
+                not_in_list = filter(lambda x: x != (cell_copy for cell_copy in openlist_copy), near_cells)
+                openlist.extend(not_in_list)
+                #《这里再用一次filter查教程后是因为filter只能迭代一次》
+                #《filter好jb难用 我是因为看它性能消耗少才用的QAQ 换一个吧》
+                not_in_list = filter(lambda x: x != (cell_copy for cell_copy in openlist_copy), near_cells)
+                
+                #《这里的添加节点能运行但是加不进去 只有一开始的父节点加得进去》
+                for not_in_cell in not_in_list:
+                    path_tree.add_child(path_tree.find(close_cell),not_in_cell)
+
+
+        ending_nodes = path_tree.find(ending_point)
+        for node in ending_nodes.get_ancestors()[::-1]:
+            self.path.append(node)
+            self.iterator = snake.create_iterator(self.path)
\ No newline at end of file
diff --git a/apple.py b/apple.py
index a0a9473..60a17e8 100644
--- a/apple.py
+++ b/apple.py
@@ -1,11 +1,11 @@
-import random
-
-
-class Apple():
-    def __init__(self,settings):
-        self.x = random.randint(1, settings.cell_w - 1)
-        self.y = random.randint(1, settings.cell_h - 1)
-    
-    def spawn(self,settings):
-        self.x = random.randint(1, settings.cell_w - 1)
+import random
+
+
+class Apple():
+    def __init__(self,settings):
+        self.x = 7#random.randint(1, settings.cell_w - 1)
+        self.y = 5#random.randint(1, settings.cell_h - 1)
+        self.coords = {'x':self.x,'y':self.y}
+    def spawn(self,settings):
+        self.x = random.randint(1, settings.cell_w - 1)
         self.y = random.randint(1, settings.cell_h - 1)
\ No newline at end of file
diff --git a/data_structure.py b/data_structure.py
new file mode 100644
index 0000000..25f3eb5
--- /dev/null
+++ b/data_structure.py
@@ -0,0 +1,53 @@
+class TreeNode:
+    def __init__(self, value, parent=None):
+        self.value = value
+        self.parent = parent
+        self.children = []
+
+    def add_child(self, child_node):
+        child_node.parent = self
+        self.children.append(child_node)
+
+    def remove_child(self, child_node):
+        self.children = [child for child in self.children if child is not child_node]
+        child_node.parent = None
+
+    def __repr__(self, level=0):
+        ret = "\t" * level + repr(self.value) + "\n"
+        for child in self.children:
+            ret += child.__repr__(level + 1)
+        return ret
+
+    def get_ancestors(self):
+        """返回当前节点及其所有祖先节点"""
+        ancestors = []
+        node = self
+        ancestors.append(node)
+        while node.parent:
+            ancestors.append(node.parent)
+            node = node.parent
+        return ancestors
+
+class Tree:
+    def __init__(self, root_value):
+        self.root = TreeNode(root_value)
+
+    def add_child(self, parent_node, child_value):
+        if not parent_node:
+            parent_node = self.root
+        parent_node.add_child(TreeNode(child_value))
+
+    def find(self, value):
+        return self._find_in_node(self.root, value)
+
+    def _find_in_node(self, node, value):
+        if node.value == value:
+            return node
+        for child in node.children:
+            found_node = self._find_in_node(child, value)
+            if found_node:
+                return found_node
+        return None
+
+    def __repr__(self):
+        return repr(self.root)
\ No newline at end of file
diff --git a/game_functions.py b/game_functions.py
index bf74099..46b75ff 100644
--- a/game_functions.py
+++ b/game_functions.py
@@ -1,168 +1,199 @@
-import pygame
-import sys
-
-
-def check_events(settings):
-    for event in pygame.event.get():
-        # 当按关闭或者按ESC键退出游戏
-        if event.type == pygame.QUIT:
-            pygame.quit()
-            sys.exit()
-        elif event.type == pygame.KEYDOWN:
-            if event.key == pygame.K_ESCAPE:
-                pygame.quit()
-                sys.exit()
-            # 按1键选择手动模式
-            elif event.key == pygame.K_1:
-                settings.game_mode = 1
-            # 按2键选择自动模式
-            elif event.key == pygame.K_2:
-                settings.game_mode = 2
-
- 
-def check_play_events(snake):
-    """检测游戏过程中的按键"""
-    for event in pygame.event.get():
-        if event.type == pygame.QUIT:
-            pygame.quit()
-            sys.exit()
-        elif event.type == pygame.KEYDOWN:
-            if event.key == pygame.K_ESCAPE:
-                pygame.quit()
-                sys.exit()
-            elif event.key == pygame.K_LEFT and not snake.direction == 'right':  #防止反向移动
-                snake.direction = 'left'
-                break
-            elif event.key == pygame.K_RIGHT and not snake.direction == 'left':
-                snake.direction = 'right'
-                break
-            elif event.key == pygame.K_UP and not snake.direction == 'down':
-                snake.direction = 'up'
-                break
-            elif event.key == pygame.K_DOWN and not snake.direction == 'up':
-                snake.direction = 'down'
-                break
-
-
-def show_start(settings, screen):
-    """模式选择界面"""
-    title_Font = pygame.font.Font(settings.font_name, 80)  # 设置标题字体
-    title_image = title_Font.render("贪吃蛇", True, (255, 255, 255), (0, 0, 0))
-    title_rect = title_image.get_rect()
-    title_rect.center = screen.get_rect().center
-
-    presskey_font = pygame.font.Font(settings.font_name, 15)  # 设置说明文字的字体
-    presskey_image = presskey_font.render(
-        '按1为手动模式,按2为自动模式,按ESC可退出游戏', True, (255, 255, 255), (0, 0, 0))
-    presskey_rect = presskey_image.get_rect()
-    presskey_rect.centerx = title_rect.centerx
-    presskey_rect.top = title_rect.bottom
-    
-    screen.fill(settings.bg_color)  # 绘制屏幕
-    screen.blit(title_image, title_rect)  # 绘制标题
-    screen.blit(presskey_image, presskey_rect)  # 绘制说明文字
-    while True:
-        check_events(settings)  # 检测键盘
-        if settings.game_mode != 0:  # 说明按了1或2，退出循环
-            break
-        pygame.display.flip()
-
-
-def show_end(settings, screen):
-    """失败结算界面"""
-    title_font = pygame.font.Font(settings.font_name, 80)
-    game_image = title_font.render('Game', True, (233, 150, 122))
-    over_image = title_font.render('Over', True, (233, 150, 122))
-    game_rect = game_image.get_rect()
-    over_rect = over_image.get_rect()
-    screen_rect = screen.get_rect()
-    game_rect.midtop = (settings.width / 2, screen_rect.top + 70)
-    over_rect.midtop = (settings.width / 2, game_rect.bottom + 50)
-    screen.blit(game_image, game_rect)
-    screen.blit(over_image, over_rect)
-    pygame.display.flip()
-    pygame.time.wait(1500)
-    settings.game_mode = 0
-
-
-def draw_grid(settings, screen):
-    # 绘制横向线
-    for x in range(0, settings.width, settings.cell_size):
-        pygame.draw.line(screen, (40, 40, 40), (x, 0), (x, settings.height))
-    # 绘制竖向线
-    for y in range(0, settings.height, settings.cell_size):
-        pygame.draw.line(screen, (40, 40, 40), (0, y), (settings.width, y))
-
-
-def draw_snake(settings, screen, snake):
-    # 头部用白色
-    head_index = snake.coords[0]
-    x = head_index['x'] * settings.cell_size
-    y = head_index['y'] * settings.cell_size
-    snake_head_rect = pygame.Rect(
-        x, y, settings.cell_size, settings.cell_size)
-    pygame.draw.rect(screen, (255, 255, 255), snake_head_rect)
-    # 蛇身内部用浅绿，外框用深绿
-    for bodies_index in snake.coords[1: -1]:
-        x = bodies_index['x'] * settings.cell_size
-        y = bodies_index['y'] * settings.cell_size
-        snake_part_rect = pygame.Rect(
-            x, y, settings.cell_size, settings.cell_size)
-        pygame.draw.rect(screen, (0, 155, 0), snake_part_rect)
-        snake_part_inner_rect = pygame.Rect(
-            x + 4, y + 4, settings.cell_size - 8, settings.cell_size - 8)
-        pygame.draw.rect(screen, (0, 255, 0), snake_part_inner_rect)
-    # 蛇尾用浅绿
-    tail_index = snake.coords[-1]
-    x = tail_index['x'] * settings.cell_size
-    y = tail_index['y'] * settings.cell_size
-    snake_tail_rect = pygame.Rect(
-        x, y, settings.cell_size, settings.cell_size)
-    pygame.draw.rect(screen, (0, 255, 0), snake_tail_rect)
-
-
-def draw_apple(apple,settings,screen):
-    x = apple.x * settings.cell_size
-    y = apple.y * settings.cell_size
-    apple_rect = pygame.Rect(
-        x, y, settings.cell_size, settings.cell_size)
-    pygame.draw.rect(screen, (255, 0, 0), apple_rect)
-
-
-# 绘制游戏界面
-def update_screen(settings, screen, snake,apple):
-    screen.fill(settings.bg_color)
-    draw_grid(settings, screen)
-    draw_apple(apple,settings,screen)
-    # 移动蛇
-    snake.move_head()  # 加蛇头
-    if game_over(snake,settings):
-        settings.game_mode = -1
-    elif eat_apple(snake,apple):
-        apple.spawn(settings)
-        draw_apple(apple,settings,screen)
-    else:
-        del snake.coords[-1]  # 去蛇尾
-    draw_snake(settings, screen, snake)
-    pygame.display.flip()
-    # 暂停一下
-    settings.my_clock.tick(settings.clock_frq)
-
-
-def game_over(snake,settings):
-    # 碰到左右墙壁
-    if (snake.coords[snake.head_index]['x'] == -1 or snake.coords[snake.head_index]['x'] == settings.cell_w):
-        return True
-    # 碰到上下墙壁
-    if (snake.coords[snake.head_index]['y'] == -1 or snake.coords[snake.head_index]['y'] == settings.cell_h):
-        return True
-    # 碰到自己
-    if (snake.coords[snake.head_index] in snake.coords[1:]):
-        return True
-    return False
-
-
-def eat_apple(snake,apple):
-    if (snake.coords[snake.head_index]['x'] == apple.x and snake.coords[snake.head_index]['y'] == apple.y):
-        return True
+import pygame
+import sys
+
+#函数名含义：check events for mode (selecting),下同
+def check_mode_events(settings):
+    for event in pygame.event.get():
+        # 当按关闭或者按ESC键退出游戏
+        if event.type == pygame.QUIT:
+            pygame.quit()
+            sys.exit()
+        elif event.type == pygame.KEYDOWN:
+            if event.key == pygame.K_ESCAPE:
+                pygame.quit()
+                sys.exit()
+            # 按1键选择手动模式
+            elif event.key == pygame.K_1:
+                settings.game_mode = 1
+            # 按2键选择自动模式
+            elif event.key == pygame.K_2:
+                settings.game_mode = 2
+
+ 
+def check_play_events(snake):
+    """检测游戏过程中的按键"""
+    for event in pygame.event.get():
+        if event.type == pygame.QUIT:
+            pygame.quit()
+            sys.exit()
+        elif event.type == pygame.KEYDOWN:
+            if event.key == pygame.K_ESCAPE:
+                pygame.quit()
+                sys.exit()
+            elif event.key == pygame.K_LEFT and not snake.direction == 'right':  #防止反向移动
+                snake.direction = 'left'
+                break
+            elif event.key == pygame.K_RIGHT and not snake.direction == 'left':
+                snake.direction = 'right'
+                break
+            elif event.key == pygame.K_UP and not snake.direction == 'down':
+                snake.direction = 'up'
+                break
+            elif event.key == pygame.K_DOWN and not snake.direction == 'up':
+                snake.direction = 'down'
+                break
+
+
+def autocheck_events(ai,snake,apple,settings):
+    for event in pygame.event.get():
+        if event.type == pygame.QUIT:
+            pygame.quit()
+            sys.exit()
+        elif event.type == pygame.KEYDOWN:
+            if event.key == pygame.K_ESCAPE:
+                pygame.quit()
+                sys.exit()
+    if eat_apple(snake,apple):
+        ai.start(snake,apple,settings)
+
+def show_start(settings, screen):
+    """模式选择界面"""
+    title_Font = pygame.font.Font(settings.font_name, 80)  # 设置标题字体
+    title_image = title_Font.render("贪吃蛇", True, (255, 255, 255), (0, 0, 0))
+    title_rect = title_image.get_rect()
+    title_rect.center = screen.get_rect().center
+
+    presskey_font = pygame.font.Font(settings.font_name, 15)  # 设置说明文字的字体
+    presskey_image = presskey_font.render(
+        '按1为手动模式,按2为自动模式,按ESC可退出游戏', True, (255, 255, 255), (0, 0, 0))
+    presskey_rect = presskey_image.get_rect()
+    presskey_rect.centerx = title_rect.centerx
+    presskey_rect.top = title_rect.bottom
+    
+    screen.fill(settings.bg_color)  # 绘制屏幕
+    screen.blit(title_image, title_rect)  # 绘制标题
+    screen.blit(presskey_image, presskey_rect)  # 绘制说明文字
+    while True:
+        check_mode_events(settings)  # 检测键盘
+        if settings.game_mode != 0:  # 说明按了1或2，退出循环
+            break
+        pygame.display.flip()
+
+
+def show_end(settings, screen):
+    """失败结算界面"""
+    title_font = pygame.font.Font(settings.font_name, 80)
+    game_image = title_font.render('Game', True, (233, 150, 122))
+    over_image = title_font.render('Over', True, (233, 150, 122))
+    game_rect = game_image.get_rect()
+    over_rect = over_image.get_rect()
+    screen_rect = screen.get_rect()
+    game_rect.midtop = (settings.width / 2, screen_rect.top + 70)
+    over_rect.midtop = (settings.width / 2, game_rect.bottom + 50)
+    screen.blit(game_image, game_rect)
+    screen.blit(over_image, over_rect)
+    pygame.display.flip()
+    pygame.time.wait(1500)
+    settings.game_mode = 0
+
+
+def draw_grid(settings, screen):
+    # 绘制横向线
+    for x in range(0, settings.width, settings.cell_size):
+        pygame.draw.line(screen, (40, 40, 40), (x, 0), (x, settings.height))
+    # 绘制竖向线
+    for y in range(0, settings.height, settings.cell_size):
+        pygame.draw.line(screen, (40, 40, 40), (0, y), (settings.width, y))
+
+
+def draw_snake(settings, screen, snake):
+    # 头部用白色
+    head_index = snake.coords[0]
+    x = head_index['x'] * settings.cell_size
+    y = head_index['y'] * settings.cell_size
+    snake_head_rect = pygame.Rect(
+        x, y, settings.cell_size, settings.cell_size)
+    pygame.draw.rect(screen, (255, 255, 255), snake_head_rect)
+    # 蛇身内部用浅绿，外框用深绿
+    for bodies_index in snake.coords[1: -1]:
+        x = bodies_index['x'] * settings.cell_size
+        y = bodies_index['y'] * settings.cell_size
+        snake_part_rect = pygame.Rect(
+            x, y, settings.cell_size, settings.cell_size)
+        pygame.draw.rect(screen, (0, 155, 0), snake_part_rect)
+        snake_part_inner_rect = pygame.Rect(
+            x + 4, y + 4, settings.cell_size - 8, settings.cell_size - 8)
+        pygame.draw.rect(screen, (0, 255, 0), snake_part_inner_rect)
+    # 蛇尾用浅绿
+    tail_index = snake.coords[-1]
+    x = tail_index['x'] * settings.cell_size
+    y = tail_index['y'] * settings.cell_size
+    snake_tail_rect = pygame.Rect(
+        x, y, settings.cell_size, settings.cell_size)
+    pygame.draw.rect(screen, (0, 255, 0), snake_tail_rect)
+
+
+def draw_apple(apple,settings,screen):
+    x = apple.x * settings.cell_size
+    y = apple.y * settings.cell_size
+    apple_rect = pygame.Rect(
+        x, y, settings.cell_size, settings.cell_size)
+    pygame.draw.rect(screen, (255, 0, 0), apple_rect)
+
+
+# 绘制游戏界面
+def update_screen(settings, screen, snake,apple):
+    screen.fill(settings.bg_color)
+    draw_grid(settings, screen)
+    draw_apple(apple,settings,screen)
+    # 移动蛇
+    snake.move_head()  # 加蛇头
+    if game_over(snake,settings):
+        settings.game_mode = -1
+    elif eat_apple(snake,apple):
+        apple.spawn(settings)
+        draw_apple(apple,settings,screen)
+    else:
+        del snake.coords[-1]  # 去蛇尾
+    draw_snake(settings, screen, snake)
+    pygame.display.flip()
+    # 暂停一下
+    settings.my_clock.tick(settings.clock_frq)
+
+
+def autoupdate_screen(settings, screen, snake,apple,ai):
+    screen.fill(settings.bg_color)
+    draw_grid(settings, screen)
+    draw_apple(apple,settings,screen)
+    # 移动蛇
+    snake.automove_head(ai)  # 加蛇头
+    if game_over(snake,settings):
+        settings.game_mode = -1
+    elif eat_apple(snake,apple):
+        apple.spawn(settings)
+        draw_apple(apple,settings,screen)
+    else:
+        del snake.coords[-1]  # 去蛇尾
+    draw_snake(settings, screen, snake)
+    pygame.display.flip()
+    # 暂停一下
+    settings.my_clock.tick(settings.clock_frq)
+
+
+def game_over(snake,settings):
+    # 碰到左右墙壁
+    if (snake.coords[snake.head_index]['x'] == -1 or snake.coords[snake.head_index]['x'] == settings.cell_w):
+        return True
+    # 碰到上下墙壁
+    if (snake.coords[snake.head_index]['y'] == -1 or snake.coords[snake.head_index]['y'] == settings.cell_h):
+        return True
+    # 碰到自己
+    if (snake.coords[snake.head_index] in snake.coords[1:]):
+        return True
+    return False
+
+
+def eat_apple(snake,apple):
+    if (snake.coords[snake.head_index] == apple.coords):
+        return True
     return False
\ No newline at end of file