作业2

import turtle
>>> turtle.forward(100)
>>> turtle.forward(100)
>>> turtle.clear()
>>> turtle.forward(100)
>>> ard(100)
Traceback (most recent call last):
  File "<pyshell#5>", line 1, in <module>
    ard(100)
NameError: name 'ard' is not defined
>>> turtle.left(90)
>>> turtle.forward(100)
>>> turtle.circle(50)
>>> turtle.forward(100)
>>> turtle.circle(50,steps=8)
>>> turtle.forward(100)
>>> turtle.left(90)
>>> turtle.right(90)
>>> turtle.right(90)
>>> turtle.forward(100)
>>> turtle.right(90)
>>> turtle.forward(100)
>>> turtle.circle(50,steps=8)
>>> turtle.forward(100)
>>> turtle.circle(50)
>>> turtle.forward(100)
>>> turtle.right(90)
>>> turtle.forward(100)
>>> turtle.color('blue')
>>> turtle,shape('turtle')
Traceback (most recent call last):
  File "<pyshell#25>", line 1, in <module>
    turtle,shape('turtle')
NameError: name 'shape' is not defined
>>> turtle.circle(50,steps=8)
>>> turtle,shape('arrow')
Traceback (most recent call last):
  File "<pyshell#27>", line 1, in <module>
    turtle,shape('arrow')
NameError: name 'shape' is not defined
>>> turtle.shape('turtle')
>>> turtle,shape('turtle')
Traceback (most recent call last):
  File "<pyshell#29>", line 1, in <module>
    turtle,shape('turtle')
NameError: name 'shape' is not defined
>>> turtle.shape('arrow')
>>> turtle.goto(0,100)
>>>