How to loop back to the beginning?

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Python3.6

How can I loop back to the beginning, when my player hit one of the white squares? I have tried to loop, but I don’t know where I can set the while loop, to restart the game from Scratch. Loop back, and start to move from the beginning. In other words, restart the game.

import turtle
import math

wn = turtle.Screen()
wn.bgcolor("blue")
wn.tracer(3)

player = turtle.Turtle()
player.color("red")
player.shape("circle")
player.penup()
player.speed(0)
player.setposition(-225, 50)

square = turtle.Turtle()
square.color("white")
square.shape("square")
square.penup()
square.speed(0)
square.setposition(-200, 100)

square_2 = turtle.Turtle()
square_2.color("white")
square_2.shape("square")
square_2.penup()
square_2.speed(0)
square_2.setposition(-250, 50)

speed = 0.4

def turnleft():
    player.left(90)

def turnright():
    player.right(90)

turtle.listen()
turtle.onkey(turnleft, "Left")
turtle.onkey(turnright, "Right")

while True:
    player.forward(speed)

    d = math.sqrt(math.pow(player.xcor()-square.xcor(),2) + math.pow(player.ycor()-square.ycor(),2))
    if d < 20:
        square.q()

    d = math.sqrt(math.pow(player.xcor()-square_2.xcor(),2) + math.pow(player.ycor()-square_2.ycor(),2))
    if d < 20:
       square_2.q()

What I have tried:

I have tried to set the code into a loop. But I didn’t figure out, how to loop from the beginning of the code.