save project

my_tree.py

 import turtle
 import turtle
+import random
+
+pen = turtle.Turtle()
+pen.color('sienna')
+pen.speed(0)
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat') 
+
+pen.left(90)
+pen.up()
+pen.backward(150)
+pen.down()
 
 
 def tree(n):
 def tree(n):
     if n>= 0:
     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()
+
         pen.forward(n)
         pen.forward(n)
         pen.right(30)
         pen.right(30)
         tree(n-10)
         tree(n-10)
@@ -24,4 +57,4 @@ pen.backward(150)
 pen.down()
 pen.down()
 
 
 tree(60)
 tree(60)
-turtle.done()
+turtle.done()
\ No newline at end of file