save project

my_tree.py

 import turtle
 import turtle
-
+i
 pen = turtle.Turtle()
 pen = turtle.Turtle()
 pen.color('sienna')
 pen.color('sienna')
 # 画布大小
 # 画布大小
 w = turtle.Screen()
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 w.bgcolor('wheat')      # wheat小麦
-
+def a(n):
+    if n>=30:
+        turtle.forward(n)
+        turtle.right(30)
+        a(n-10)
+        turtle.left(60)
+        a(n-10)
+        turtle.right(30)
+        turtle.up()
+        turtle.backward(n)
+        turtle.down()
 # 移动到起点
 # 移动到起点
-pen.left(90)
-pen.up()
-pen.backward(150)    # 后退
-pen.down()
-pen.forward(100)
-pen.left(30)
-pen.forward(50)
-pen.backward(50)
-pen.right(60)
-pen.forward(50)
-pen.backward(50)
-pen.right(150)
-pen.backward(-100)
+turtle.left(90)
+turtle.up()
+turtle.backward(150)    # 后退
+turtle.down()
+
+a(90)
 turtle.done()
 turtle.done()