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diy3.py

 # 利用write()帮助悟空给诺依回信吧~
 import turtle
-screen=turtle.Screen()
-screen.bgcolor("light blue")
-# len=screen.textinput("100","100")
-# len=int(len)
+screen=turtle.Screen()#操作画布
+screen.bgcolor("light blue")#画布背景颜色
+len=screen.textinput("100","100")#弹窗
+len=int(len)
 pen=turtle.Pen()
 pen.write("你好\nSB.",font=("Times",30,"normal"))
-pen.hideturtle()
-len=60
-pen.penup()
+pen.hideturtle()#隐藏画笔
+# len=60
+pen.penup()#抬笔
 pen.goto(100,100)
 pen.pendown()
-pen.pensize(5)
-pen.pencolor("red")
+pen.pensize(5)#笔大小
+pen.pencolor("red")#笔颜色
 pen.left(45)
 pen.forward(2*len)
-pen.circle(len,180)
+pen.circle(len,180)#画圆  len半径   180方向
 pen.right(90)
 pen.circle(len,180)
 pen.forward(2*len)