save project

my_tree.py

 import turtle
-i
+import random
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 def a(n):
-    if n>=30:
+    if n>=0:
+        b=random.random()
+        c=1.5*b
         turtle.forward(n)
-        turtle.right(30)
-        a(n-10)
-        turtle.left(60)
-        a(n-10)
-        turtle.right(30)
+        turtle.right(30*b)
+        a(n-10*c)
+        turtle.left(30*2*b)
+        a(n-10*c)
+        turtle.right(30*b)
         turtle.up()
         turtle.backward(n)
         turtle.down()