auto save

1.py

+import turtle
+t=turtle.Turtle()
+for i in range(4):
+    t.forward(100)
+    t.right(90)
+turtle.done()
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2.py

+import turtle
+t=turtle.Pen()   #turtle.Turtle()
+t.penup()
+t.goto(-100,100)
+t.pendown()
+for i in range(4):
+    t.forward(200)
+    t.right(90)
+t.penup()
+t.goto(0,0)
+t.pendown()
+t.dot(20,"red")
+t.penup()
+t.goto(40,0)
+t.pendown()
+t.dot(20,"red")
+t.penup()
+t.goto(-40,0)
+t.pendown()
+t.dot(20,"red")    #括号里第一个空是直径 第二个是颜色
+turtle.done()
\ No newline at end of file