turtle.location()

turtle.setx( turtle.location()[0] + random.randint(3,10) )

def advance_turtle(turtle):
    turtle.setx( turtle.location()[0] + random.randint(3,10) )
    return ???

advance_turtle(P1)
advance_turtle(P2)
advance_turtle(P3)
advance_turtle(P4)

>>> my_string = "hello"
>>> my_string += " world"
>>> my_string
'hello world'

>>> my_string = "hello"
>>> my_string2 = my_string + " world"
>>> my_string
'hello'
>>> my_string2
'hello world'

>>> for i in range(10):
...     turle.position(random)

>>> movement = [random * 10]
>>> for i in movement:
...     move_turtle(i)

map(move_turtle, movement)

>>> move_turtle(1)

import random
import turtle
import time

## Initialize the screen and drawing turtle

screen = turtle.Screen()

track = turtle.Turtle()
track.hideturtle()
track.pensize(3)
track.speed(0)

## Draw the starting line

track.penup()
track.goto(-250,-50)
track.pendown()
track.goto(-250,50)
track.penup()

## Draw the finish line

track.penup()
track.goto(250,-50)
track.pendown()
track.goto(250,50)
track.penup()

## Initialize Racing Turtles

P1 = turtle.Turtle()
P1.penup()
P1.shape('turtle')
P1.color('red')
P1.speed(0)
P1.goto(-268,25)

P2 = turtle.Turtle()
P2.penup()
P2.shape('turtle')
P2.color('blue')
P2.speed(0)
P2.goto(-268,-25)

P1x = -268
P2x = -268

## Dramatic pause before the race
track.goto(0,125)
time.sleep(random.randint(2,5))
track.write('GO!', font=("Arial", 14, "normal"), align='center')

## Loop of racing code

done = 0 
while done == 0:
    P1x = P1x + random.randint(3,10)
    P2x = P2x + random.randint(3,10)

    P1.setx(P1x)
    P2.setx(P2x)

    if P1x >= 232 or P2x >= 232:
        done = 1

def save(data):
    data['x'] = data['x']+data['y']
    f = open('file.dat')
    print >> f, data

foo = {'x': 10, 'y': 20}
save(foo)

function advanceTurtle(distance, turtle) {
  return {
    x: turtle.x + distance,
    y: turtle.y,
    color: turtle.color
  }
}

// example race object, at races start
const freshRace = {
  turtle1: {x: 0, y: 0, color: 'red'},
  turtle2: {x: 0, y: 0, color: 'blue'},
  finishLine: 100
}

function advanceRace(t1Inc, t2Inc, race) {
  return {
    turtle1: advanceTurtle(t1Inc, race.turtle1),
    turtle2: advanceTurtle(t2Inc, race.turtle2),
    finishLine: race.finishLine
  }
}

function isOver(race) {
  return race.turtle1 >= race.finishLine ||
    race.turtle2 >= race.finishLine
}

var raceStates = [freshRace]
// the last entry in the array of states
const currentRaceState = () => raceStates.slice(-1)
// impure (can easily make a pure version for testing)
const randomJump = () => 3 + Math.floor(Math.random() * 7)

while (!isOver(currentRaceState())) {
  // do something here with the current state, 
  // like render it to a view
  //
  // perhaps pause x milliseconds between jumps
  //
  const nextState = advanceRace(randomJump(), randomJump(), currentRaceState())
  raceStates.push(nextState) // only 1 line of mutation
}