save project

my_tree.py

@@ -18,12 +18,38 @@ pen.color('sienna')
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 
-# 移动到起点pe
+# 移动到起点
+
 pen.left(90)
 pen.up()
 pen.backward(150)    # 后退
 pen.down()
 
+def tree(n):
+    if n >=0:
+        if n <=12:
+            color_list=['snow','lightcoral']
+            color=randow.choice(color_list)
+            pen.color(color)
+            pen.pensize(n / 3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n / 10)
+        pen.forwarwd(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()
+
 pen.forward(100) 
 pen.right(30)
 pen.forward(50)