try it!

import turtle
turtle.Pen()
turtle.bgcolor('red')
turtle.pensize(15)
turtle.forward(50)
turtle.left(90)
turtle.forward(100)
turtle.right(90)
turtle.forward(50)
turtle.backward(50)
turtle.left(90)
turtle.backward(50)
turtle.left(90)
turtle.forward(50)
turtle.right(90)
turtle.forward(50)
turtle.backward(50)
turtle.right(90)
turtle.forward(100)
turtle.right(90)
turtle.forward(50)