A clock dial using turtle

import turtle

screen=turtle.Screen()

trtl=turtle.Turtle()

screen.setup(620,620)

screen.bgcolor('black')

clr=['red','green','blue','yellow','purple']

trtl.pensize(4)

trtl.shape('turtle')

trtl.penup()

trtl.pencolor('red')

m=0

for i in range(12):

      m=m+1

      trtl.penup()

      trtl.setheading(-30*i+60)

      trtl.forward(150)

      trtl.pendown()

      trtl.forward(25)

      trtl.penup()

      trtl.forward(20)

      trtl.write(str(m),align="center",font=("Arial", 12, "normal"))

      if m==12:

        m=0

      trtl.home()

trtl.home()

trtl.setpos(0,-250)

trtl.pendown()

trtl.pensize(10)

trtl.pencolor('blue')

trtl.circle(250)

trtl.penup()

trtl.setpos(150,-270)

trtl.pendown()

trtl.ht()