Speed reader with Python

A script to read faster

https://github.com/rakshith-git/speed_reader-

from turtle import*
import time
tracer(0)

delay = 0.05
with open(r"reader.txt", "r") as f:
    a = f.read().split()

# there is an automatic mode where the dealy is set by the length of the word

auto = False  # make this true for auto mode

t = Turtle()
u = Turtle()
u.pu()
u.color('grey')
u.setpos(-200, 0)  # turtle graphics stetting up things
t.ht()
u.ht()
i = 0
d = Turtle()
d.pu()
d.shape("turtle")
d.setpos(200, 0)
d.pd()
d.pensize(3)
d.lt(90)
d.fd(200)
d.bk(400)
d.fd(200)
d.pu()
d.shapesize(2, 2)


def rewind():  # rewinds by 30 words when space is pressed
    global i
    if i > 30:
        i -= 30
        time.sleep(0.2)  # delay for user to know its rewinded


while i in range(0, len(a)):
    # takes the y coordinate of the turtle on the right and changes delay accordingly
    delay = 0.2-d.ycor() * 0.001
    t.write(a[i], align="center", font=("Arial", 30, ("bold", "italic")))
    u.write(round(60*(1/delay)), align="center",
            font=("Arial", 30, ("bold", "italic")))

    listen()
    onkey(rewind, 'space')
    if d.xcor != 200:
        d.setx(200)
    y = d.ycor()
    if y > 200:
        d.sety(200)  # this part is the wpm adjusting
    if y < -200:
        d.sety(-200)
    d.ondrag(d.goto)
    if auto == True:
        # dynamically changes delay word by word
        time.sleep(delay+(0.015*len(a[i])))
    if auto == False:
        time.sleep(delay)
    i += 1
    t.clear()
    u.clear()

    update()