save project

my_tree.py

 import turtle
 
+def tree(n):
+    if n>=50:
+        pen.forward(n)
+        pen.right(30)
+        tree(n-10)
+        pen.left(60)
+        tree(n-10)
+        pen.right(30)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
@@ -11,17 +23,23 @@ pen.left(90)
 pen.up()
 pen.backward(150)    # 后退
 pen.down()
+tree(80)
+'''
+#画树干
 pen.forward(100)
 pen.left(30)
+#左边
 pen.forward(50)
 pen.left(180)
+#返回
 pen.forward(50)
 pen.left(120)
+#右边并返回
 pen.forward(50)
 pen.left(180)
 pen.forward(50)
 pen.left(30)
 pen.forward(100)
 pen.left(180)
-
+'''
 turtle.done()