code

import turtle as t
import time as s
import random as r
#screen setup
nw= t.Screen()
nw.title("snake game")
nw.bgcolor("blue")
nw.setup(width=600 ,height=600)
nw.tracer(0)
#head
head = t.Turtle()
head.color("red")
head.shape("square")
head.penup()
head.speed(0)
head.goto(0,0)
head.direction="stop"
segments =[]
#food
food = t.Turtle()
food.color("black")
food.shape("circle")
food.penup()
food.speed(0)
food.goto(0,100)

def go_up():
    head.direction="up"
def go_down():
    head.direction="down"
def go_left():
    head.direction="left"
def go_right():
    head.direction="right"
def move():
    if head.direction == "up":
        y=head.ycor()
        head.sety(y+20)
    if head.direction == "down":
        y = head.ycor()
        head.sety(y-20)
    if head.direction == "left":
        x= head.xcor()
        head.setx(x - 20)
    if head.direction == "right":
        x = head.xcor()
        head.setx(x + 20)
nw.listen()
nw.onkeypress(go_up,'8')
nw.onkeypress(go_down,'2')
nw.onkeypress(go_right,'6')
nw.onkeypress(go_left,'4')
while True:
    nw.update()
    if head.xcor()>290 or head.xcor()<-290 or head.ycor()>290 or head.ycor()<-290:
        s.sleep(0.1)
        head.goto(0,0)
        head.direction="stop"
        for segment in segments:
            segment.goto(1000,1000)
        segments.clear()
    if head.distance(food)<20:
        x=r.randint(-290,290)
        y=r.randint(-290,290)
        food.goto(x,y)
        new_segment = t.Turtle()
        new_segment.color("gray")
        new_segment.shape("square")
        new_segment.penup()
        segments.append(new_segment)
        # move the end body first in reverse order
    for index in range(len(segments) - 1, 0, -1):
            x = segments[index - 1].xcor()
            y = segments[index - 1].ycor()
            segments[index].goto(x, y)
        # move body [0] to where head is
    if len(segments) > 0:
            x = head.xcor()
            y = head.ycor()
            segments[0].goto(x, y)
    move()
    # check for head collision with the body
    for segment in segments:
        if segment.distance(head) < 20:
            s.sleep(1)
            head.goto(0, 0)
            head.direction = "stop"
            # hide the body
            for segment in segments:
                segment.goto(1000, 1000)
            # clear the body list
            segments.clear()
    s.sleep(0.1)
nw.mainloop()