save project

my_tree.py

 import turtle
+import random
 
 pen = turtle.Turtle()
 pen.color('sienna')
@@ -12,15 +13,37 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 def tree(n):
-    if n >= 50:
+    if n>= 0:
         pen.forward(n)
         pen.right(30)
-        tree(n-50)
+        tree(n-10)
         pen.left(60)
-        tree(n-50)
+        tree(n-10)
         pen.right(30)
         pen.up()
         pen.backward(n)
         pen.down()
-tree(100)        
+def tree(n):
+    if n>= 0:
+        if n <=12:
+            color_list = ['snow','lightcoral']
+            color = random.choice(color_list)
+            pen.color(color)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
+            pen.forward(n)
+            angle = random.random()
+            pen.right(30*angle)
+            length = 1.5*random.random()
+            tree(n-10*length)
+            pen.left(60*angle)
+            tree(n-10*length)
+            pen.right(30*angle)
+            pen.up()
+            pen.backward(n)
+            pen.down()
+
+tree(60)        
 turtle.done()
\ No newline at end of file