snake python turtle by alfonsoperez

from turtle import Turtle, Screen
import time
import random

delay = 0.1

screen = Screen()
screen.title("Snake Game")
screen.bgcolor("white")
screen.setup(width=650, height=750)
screen.tracer(0)

t = Turtle()
t.width(15)
t.hideturtle()
t.left(180)
t.up()
t.forward(310)
t.right(90)
t.forward(310)
t.right(90)
t.down()
t.forward(615)
t.right(90)
t.forward(615)
t.right(90)
t.forward(615)
t.right(90)
t.forward(615)

food = Turtle()
food.speed(0)
food.shape("circle")
food.color("red")
food.penup()
food.goto(0,100)

hd = Turtle()
hd.shape("square")
hd.penup()
hd.color("green")
hd.speed(-1)
hd.direction = "stop"

pen = Turtle()
pen.speed(-1)
pen.color("Black")
pen.up()
pen.hideturtle()
pen.goto(0, 330)
pen.write("SNAKE LENGTH: 1",False,"center",font=("Arial Narrow",20,"bold"))

length = 1

segments = []

def go_up():
    if hd.direction != "down":
        hd.direction = "up"

def go_down():
    if hd.direction != "up":
        hd.direction = "down"

def go_left():
    if hd.direction != "right":
        hd.direction = "left"

def go_right():
    if hd.direction != "left":
        hd.direction = "right"

def movement():
    if hd.direction == "up":
        y = hd.ycor()
        hd.sety(y + 20)

    if hd.direction == "down":
        y = hd.ycor()
        hd.sety(y - 20)

    if hd.direction == "left":
        x = hd.xcor()
        hd.setx(x - 20)

    if hd.direction == "right":
        x = hd.xcor()
        hd.setx(x + 20)


screen.listen()
screen.onkeypress(go_up, "Up")
screen.onkeypress(go_up, "w")

screen.onkeypress(go_down, "Down")
screen.onkeypress(go_down, "s")

screen.onkeypress(go_left, "Left")
screen.onkeypress(go_left, "a")

screen.onkeypress(go_right, "Right")
screen.onkeypress(go_right, "d")

gameover = False

while True:

    screen.update()
    time.sleep(delay)

    if hd.distance(food) == 0:
        x = random.randint(-14, 14)
        y = random.randint(-14, 14)
        food.goto(x * 20, y * 20)

        length += 1
        pen.clear()
        pen.write("SNAKE LENGTH: {}".format(length),False,"center",font=("Arial Narrow",20,"bold"))

        new_segment = Turtle()
        new_segment.speed(-1)
        new_segment.shape("square")
        new_segment.color("limegreen")
        new_segment.penup()
        segments.append(new_segment)

        if delay > 0.001:
            delay -= 0.001

    if hd.xcor()>290 or hd.xcor()<-290 or hd.ycor()>290 or hd.ycor()<-290:
        pen.clear()
        pen.write("GAME OVER, YOUR FINAL LENGTH IS: {}".format(length),False,"center",font=("Arial Narrow",20,"bold"))
        gameover = True

    for i in range(len(segments)-1, 0, -1):
        x = segments[i-1].xcor()
        y = segments[i-1].ycor()
        segments[i].goto(x, y)


    if len(segments) > 0:
        x = hd.xcor()
        y = hd.ycor()
        segments[0].goto(x,y)

    movement()

    for segment in segments:
        if segment.distance(hd) == 0:
            pen.clear()
            pen.goto(0, 0)
            pen.write("GAME OVER, YOUR FINAL LENGTH IS: {}".format(length),False,"center",font=("Arial Narrow",20,"bold"))
            gameover = True
            break

    if gameover == True:
        break
#https://www.youtube.com/channel/UCQor7IURWM-lGT-tmFbFSCw