save project

my_tree.py

 import turtle
-im
+import random
+  
 def tree(n):
-    if n>=50:
+    if tree<=10:
+        pen.pencolor(snow) or pen.pencolor(lightcoral)
+        pen.pensize(tree/3)
+    else:
+        pen.pencolor(sienna)
+        pen.pensize(tree/10) 
+    if n>=0:
+        pen.pensize(n/10)
         pen.forward(n)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
+        angle = random.randint(0,30)
+        length = random.randint(1,15)
+        pen.right(angle)
+        tree(n-length)
+        pen.left(2*angle)
+        tree(n-length)
+        pen.right(angle)
         pen.up()
         pen.backward(n)
         pen.down()
@@ -23,5 +33,5 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 pen.color("brown")
-tree(100)
+tree(60)
 turtle.done()