save project

my_tree.py

 import turtle
-
+import random
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
+
+pen.left(90)
+pen.up()
+pen.backward(150)
+pen.down()
 def tree(n):
     if n >= 0:
+        if n <= 12:
+            color_list = ["snow","lightcoral"]
+            tree_color = random.choice(color_list)
+            pen.color(tree_color)
+            pen.pensize(n/3)
+        else:    
+            pen.color("sienna")
+            pen.pensize(n/10)
         pen.forward(n)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
+        a = random.randint(1,20)
+        b = random.randint(1,15)
+        pen.right(a)
+        tree(n-b)
+        pen.left(a*2)
+        tree(n-b)
+        pen.right(a)
         pen.up()
         pen.backward(n)
         pen.down()
+        
 # 移动到起点
 
-tree(100)
+tree(60)
 turtle.done()