auto save

1.py/2.py

 import turtle
 pen=turtle.Pen()
+pen.color('red')
+pen.speed(2)
 pen.penup()
 pen.goto(0,-50)
 pen.pendown()

1.py/4.py

+N=int(input("请输入奶牛数量。"))
+A=N*20*7
+print(N"头奶牛7天可以产"A"千克d牛奶")
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999.py

+import turtle
+pen=turtle.Pen()
+pen.pendown()
+pen.fillcolor("black")
+pen.begin_fill()
+pen.forward(100)
+pen.right(90)
+pen.forward(100)
+pen.right(90)
+pen.forward(100)
+pen.right(90)
+pen.forward(100)
+pen.right(90)
+pen.goto(0,0)
+pen.left(90)
+pen.forward(100)
+pen.left(90)
+pen.forward(100)
+pen.left(90)
+pen.forward(100)
+pen.left(90)
+pen.end_fill()
+pen.goto(0,100)
+pen.forward(100)
+pen.right(90)
+pen.forward(100)
+pen.penup()
+pen.goto(0,-100)
+pen.pendown()
+pen.right(90)
+pen.forward(100)
+pen.right(90)
+pen.forward(100)
+pen.hideturtle()
+turtle.done()
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