import turtle

tina = turtle.Turtle()

tina.speed(5)

tina.color("green")

tina.pensize(5)

length = 50#длина линий

tina.left(45)

tina.forward(length)

tina.right(180)

tina.forward(length)

for k in range(3):

 tina.right(90)

 tina.forward(length)

 tina.right(180)

 tina.forward(length)