save project

my_tree.py

 import turtle
-
+import random
 pen = turtle.Turtle()
 pen.shape("turtle")
 pen.color('sienna')
-pen.pensize(9)
+pen.pensize(3)
 pen.speed(0)
 # 画布大小
 w = turtle.Screen()
@@ -16,17 +16,29 @@ pen.backward(150)    # 后退
 pen.down()
 
 def tree(n):
-    if n>40:
+    if n>=0:
+        if n <=8:
+            color = ['snow','lightcoral']
+            a = random.choice(color)
+            pen.color(a)
+            pen.pensize(n/3)
+        else:
+            pen.color("sienna")
+            pen.pensize(n/8)
+        pen.pensize(n/10)
         pen.forward(n)
-        pen.left(30)
-        tree(n-5)
-        pen.right(60)
-        tree(n-5)
-        pen.left(30)
+        angel = random.randint(1,30)
+        lenth = random.randint(1,12)
+        pen.left(angel)
+        tree(n-lenth)
+        pen.right(2*angel)
+        tree(n-lenth)
+        pen.left(angel)
         pen.backward(n)
         pen.down()
+        
         pen.hideturtle()
 
 
-tree(100)
+tree(60)
 turtle.done()