save project

my_tree.py

@@ -2,19 +2,28 @@ import turtle
 import random
 
 def tree(n):
-    if n >= 0:
-        pen.forward(n)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
-        pen.up()
-        pen.backward(n)
-        pen.down()
+    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(100)
 turtle.done()
-
+        
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小