auto save

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
-
 # 移动到起点
 pen.left(90)
 pen.up()
 pen.backward(150)    # 后退
 pen.down()
+def zhu(z):
+    if z >=0:
+        if  z<=12:
+            color_list=['green','lightcoral']
+            color=random.choice(color_list)
+            pen.color(color)
+            pen.pensize(z/3)
+        else:
+            pen.color('red')
+            pen.speed(10)
+            pen.pensize(z / 10)
+        pen.forward(z)
+        angle=random.random()
 
+        pen.right(30*angle)
+        length=1.5*random.random()
+        zhu(z-10*length)
+        pen.left(60*angle)
+        zhu(z-10*length)
+        pen.right(30*angle)
+        pen.up()
+        pen.backward(z)
+        pen.down()
+zhu(60)
 turtle.done()