save project

my_tree.py

 import turtle
+import random
 
 pen = turtle.Turtle()
 pen.color('sienna')
@@ -9,9 +10,9 @@ w.bgcolor('wheat')      # wheat小麦
 # 移动到起点
 pen.left(90)
 pen.up()
-pen.backward(300)    # 后退
+pen.backward(150)    # 后退
 pen.down()
-
+pen.speed(10)
 # pen.forward(100)
 # pen.right(30)
 # pen.forward(50)
@@ -28,18 +29,28 @@ pen.down()
 # pen.forward(-100)
 
 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.right(30)
+        angle = random.randint(1,30)
+        length = random.randint(2,15)
+        pen.right(angle)
         tree(n-10)
-        pen.left(60)
+        pen.left(angle*2)
         tree(n-10)
-        pen.right(30)
+        pen.right(angle)
         pen.penup()
         pen.backward(n)
         pen.pendown()
 
 
 
-tree(100)
+tree(60)
 turtle.done()