Python-Art, Digital Clock

import time
import datetime as dt
import turtle

# create a turtle to display time
t = turtle.Turtle()

# create a turtle to create rectangle box
t1 = turtle.Turtle()

# create screen
s = turtle.Screen()

# set background color of the screen
s.bgcolor("green")

# obtain current hour, minute and second
# from the system
sec = dt.datetime.now().second
min = dt.datetime.now().minute
hr = dt.datetime.now().hour
t1.pensize(3)
t1.color('black')
t1.penup()

# set the position of turtle
t1.goto(-20, 0)
t1.pendown()

# create rectangular box
for i in range(2):
    t1.forward(200)
    t1.left(90)
    t1.forward(70)
    t1.left(90)

# hide the turtle
t1.hideturtle()

while True:
    t.hideturtle()
    t.clear()
    # display the time
    t.write(str(hr).zfill(2)
            + ":" + str(min).zfill(2) + ":"
            + str(sec).zfill(2),
            font=("Arial Narrow", 35, "bold"))
    time.sleep(1)
    sec += 1

    if sec == 60:
        sec = 0
        min += 1

    if min == 60:
        min = 0
        hr += 1

    if hr == 13:
        hr = 1