import turtle
from turtle import *
import time

data = [
    ">>>>>vvvvv<<<<^^^^",
    ">>>v<^^>>",
    "<<<<^^^^>>>>>vv<<<<<<<<<<<vvv>>>^^^^^^^>>>>>>>>>>vvvvvv"
]

def put (arg, pos=None, align="left", font=("Sans Serif", 12, "normal")):
    oldspeed = turtle.speed()
    oldpos = turtle.pos()
    if pos == None:
        pos = oldpos

    penup()
    speed(0)
    stampid = stamp() # タートル(矢印)の点滅を防ぐため
    setpos(pos)
    write(arg, move=True, align=align, font=font)
    lastpos = turtle.pos()
    setpos(oldpos)
    clearstamp(stampid)
    speed(oldspeed)
    pendown()

    return lastpos

title("odai-pt13-601")
setup(width=600, height=500)
setheading(0)

for s in data:
    echopos = (-window_width()/2, -window_height()/2)

    time.sleep(2)
    clear()
    penup()
    setpos(0, 0)
    pendown()

    for i, c in enumerate(s):
        if c == ">":
            setheading(0)
        elif c == "v":
            setheading(270)
        elif c == "<":
            setheading(180)
        elif c == "^":
            setheading(90)

        if i > 0:
            echopos = put(c, echopos)
            forward(25)
            time.sleep(0.03)

exitonclick()