save project

my_tree.py

 # 创建画笔 pen
 import turtle
 def tree(n)
-    if n >=0
-    pen.forwad(n)
-    pen.right(30)
-    tree(n-10)
-    pen.left(60)
-    tree(n-10)
-    pen.right(30)
-    pen.up()
+    if n >=0:
+        color_list = ['snow','lightcoral']
+        color = random.cholce(color_list)
+        pen.color(color)
+
+    else:
+        pen.color('sienna')
+        pen.pensize(n / 10)
+    pen.forward(n)
+    angle = random.randm()
+    pen.right(30*angle)
+    length = 1.5*random.random()
+    tree(n-10*lenth)
+    pen.left(60*angle)
+    tree(n-10*length)
+    pen.rigth(30*angle)
+    pen.up
     pen.backward(n)
-    pen.down()
-pen=t.Pen()
+    pen.down
 # 设置画笔颜色为'sienna'
 pen.pencolor('sienna')
 pen.speed(0)