save project

my_tree.py

 import turtle
+import random
 
 def tree(n):
-    if n>=50:
+    if n>=0:
+        a=random.randint(0,30)
+        b=random.randint(1,15)
         pen.forward(n)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
+        pen.right(a)
+        tree(n-b)
+        pen.left(2*a)
+        tree(n-b)
+        pen.right(a)
         pen.up()
         pen.backward(n)
         pen.down()
@@ -21,5 +24,5 @@ w.bgcolor('wheat')      # wheat小麦
 
 # 移动到起点
 pen.lt(90)
-tree(100)
+tree(60)
 turtle.done()