save project

my_tree.py

 import turtle
 import turtle
+import random
 
 
 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)
         pen.forward(n)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
+        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.up()
         pen.backward(n)
         pen.backward(n)
         pen.down()
         pen.down()
 
 
 pen = turtle.Turtle()
 pen = turtle.Turtle()
 pen.color('sienna')
 pen.color('sienna')
-pen.speed(10)
+pen.speed(0)
 # 画布大小
 # 画布大小
 w = turtle.Screen()
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 w.bgcolor('wheat')      # wheat小麦
@@ -22,7 +33,7 @@ w.bgcolor('wheat')      # wheat小麦
 # 移动到起点
 # 移动到起点
 pen.left(90)
 pen.left(90)
 pen.up()
 pen.up()
-pen.backward(180)    # 后退
+pen.backward(150)    # 后退
 pen.down()
 pen.down()
 
 
 tree(60)
 tree(60)