save project

my_tree.py

@@ -12,15 +12,25 @@ pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
 def tree(n):
 def tree(n):
-    if n >= 50:
+    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)
         pen.forward(n)
-        pen.right(30)
-        tree(n-50)
-        pen.left(60)
-        tree(n-50)
-        pen.right(30)
+        angle = random.random()
+        length = random.random()
+        pen.right(30*angle)
+        tree(n-10*length)
+        pen.left(60*angle)
+        tree(n-10*length)
+        pen.right(30*angle)
         pen.up()
         pen.up()
         pen.backward(n)
         pen.backward(n)
         pen.down()
         pen.down()
-tree(100)
+tree(50)
 turtle.done()
 turtle.done()