save project

my_tree.py

 import turtle
+import random
 
 pen = turtle.Turtle()
 pen.color('sienna')
@@ -14,16 +15,26 @@ pen.down()
 pen.speed(999)
 
 def tree(n):
-    if n >= 20:
+    if n >= 0:
+        if n <= 20:
+            hua = ["blue", "green"]
+            color = random.choice(hua)
+            pen.color(color)
+            pen.pensize(n/3)
+        else:
+            pen.color("sienna")
+            pen.pensize(n/10)
+        chang = random.randint(1,20)
+        jiaodu = random.randint(10,30)
         pen.forward(n)
-        pen.right(30)
-        tree(n-20)
-        pen.left(60)
-        tree(n-20)
-        pen.right(30)
+        pen.right(jiaodu)
+        tree(n-chang)
+        pen.left(2*jiaodu)
+        tree(n-chang)
+        pen.right(jiaodu)
         pen.up()
         pen.backward(n)
         pen.down()
 
-tree(120)
+tree(80)
 turtle.done()