用python写一个贪吃蛇不用Pygame

当然可以，编写一个简单的Python贪吃蛇游戏并不一定需要Pygame库，因为Python的标准库`turtle`就非常适合用来做这种绘图和动画的练习。下面是一个简化的贪吃蛇游戏示例：

import turtle
import random

# 初始化游戏参数
snake_speed = 0.1
snake_length = 5
snake = [(0, 0)] * snake_length
direction = "right"
food_pos = (random.randint(-280, 280), random.randint(-280, 280))
score = 0

def move_snake():
    x, y = snake[-1]
    if direction == "up":
        y -= snake_speed
    elif direction == "down":
        y += snake_speed
    elif direction == "left":
        x -= snake_speed
    else:
        x += snake_speed
    
    new_head = (x, y)
    snake.insert(0, new_head)

    # 判断是否吃到食物
    if snake[0] == food_pos:
        score += 1
        grow_snake()
        food_pos = place_food(snake_length + snake_speed)
    else:
        tail = snake.pop()
        window.clear()
        window.penup()
        window.goto(tail)
        window.pendown()

def grow_snake():
    global snake_length
    snake_length += 1

def place_food(length):
    while True:
        x, y = random.randint(-280, 280), random.randint(-280, 280)
        if not any(point == (x, y) for point in snake):
            return x, y

def game_loop():
    window.listen()
    window.onkey(move_up, "Up")
    window.onkey(move_down, "Down")
    window.onkey(move_left, "Left")
    window.onkey(move_right, "Right")

    while True:
        window.update()
        move_snake()
        print(f"Score: {score}")

def move_up():
    global direction
    direction = "up"

def move_down():
    global direction
    direction = "down"

def move_left():
    global direction
    direction = "left"

def move_right():
    global direction
    direction = "right"

# 创建画布并设置初始位置
window = turtle.Screen()
window.bgcolor("black")
window.title("Simple Snake Game")
turtle.speed(0)
turtle.shape("turtle")
turtle.color("white")
turtle.penup()
turtle.hideturtle()

# 开始游戏循环
game_loop()

在这个例子中，我们使用了`turtle`模块来绘制屏幕、控制蛇的移动和放置食物。你可以将这个代码复制到一个`.py`文件运行起来，然后通过键盘的方向键控制蛇的行为。