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eating_snake.py

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+import turtle
+from random import randrange
+
+snake = [[0, 0]]
+aim = [0, 10]
+food = [-10, 0]
+
+
+def change_direction(x, y):
+    aim[0] = x
+    aim[1] = y
+
+
+def sqaure(x, y, size, color):
+    turtle.penup()
+    turtle.goto(x, y)
+    turtle.pendown()
+    turtle.begin_fill()
+    turtle.color(color)
+    for i in range(4):
+        turtle.forward(size)
+        turtle.left(90)
+    turtle.end_fill()
+
+
+import copy
+
+
+def inside(head):
+    return -250 < head[0] < 250 and -250 < head[1] < 250
+
+
+def snake_move():
+    head = [snake[-1][0], snake[-1][1]]
+    head = [head[0] + aim[0], head[1] + aim[1]]
+    if head in snake or not inside(head):
+        sqaure(head[0], head[1], 10, 'red')
+        turtle.update()
+        return
+    if head == food:
+        print("snake", len(snake))
+        food[0] = randrange(-15, 15) * 10
+        food[1] = randrange(-15, 15) * 10
+    else:
+        snake.pop(0)
+    snake.append(head)
+    turtle.clear()
+    sqaure(food[0], food[1], 10, "green")
+    for body in snake:
+        sqaure(body[0], body[1], 10, "black")
+    turtle.update()
+    turtle.ontimer(snake_move, 300)
+
+
+turtle.setup(500, 500)
+turtle.hideturtle()
+turtle.listen()
+turtle.onkey(lambda: change_direction(0, 10), "Up")
+turtle.onkey(lambda: change_direction(0, -10), "Down")
+turtle.onkey(lambda: change_direction(-10, 0), "Left")
+turtle.onkey(lambda: change_direction(10, 0), "Right")
+turtle.tracer(False)
+snake_move()
+turtle.done()