import turtle
import random
t = turtle.Turtle()
t.speed(0) # 1:slowest, 3:slow, 5:normal, 10:fast, 0:fastest

kierunki = [0,90,180,270]

def powrot():
  x,y = t.pos()
  if x>200:
    t.setheading(180)
  elif x<-200:
    t.setheading(0)
  elif y>200:
    t.setheading(270)
  elif y<-200:
    t.setheading(90)

while (True):
  t.setheading(random.choice(kierunki))
  powrot()
  t.forward(random.randint(38,42))