Why it displays attribute error for Turtle()

Question

import turtle

my_turtle = turtle.Turtle()

def square(length, angle):
my_turtle.forward(length)
my_turtle.right(angle)
my_turtle.forward(length)
my_turtle.right(angle)
my_turtle.forward(length)
my_turtle.right(angle)
my_turtle.forward(length)

for i in range(1000000):
square(10, 90)

Answer 1

Just for the record, it is tkinter and not thinker. Which, you don't need to install if you're using turtle anyway

Answer 2

I had the same problem. I was told that SoloLearn can not support graphics. If you want to use turtle though, you can download python on your laptop and download thinker .