auto save

my_tree.py

 import turtle
+import random
 
 pen = turtle.Turtle()
 pen.color('sienna')
@@ -7,24 +8,34 @@ w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 
 # 移动到起点
+pen.speed(100)
 pen.left(90)
 pen.up()
 pen.backward(150)    # 后退
 pen.down()
 
-pen.forward(100)
-#主干
-pen.right(30)
-pen.forward(50)
-pen.up()
-pen.backward(50)
-pen.down()
-pen.left(60)
-pen.forward(50)
-pen.up()
-pen.backward(50)
-pen.right(30)
-pen.backward(100)
-pen.down()
+def tree(n):
+    if n >= 0:
+        if n <= 12:
+            color_list = ['snow','lightcoral']
+            color = random.choice(color_list)
+            pen.pencolor(color)
+            pen.pensize(n/3)
+        else:
+            pen.pencolor('sienna')
+            pen.pensize(n/10)
+        pen.forward(n)
+        a = random.randint(0,30)
+        l = random.randint(1,15)
+        pen.right(a)
+        tree(n-l)
+        pen.left(2*a)
+        tree(n-l)
+        pen.right(a)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
 
+tree(60)
 turtle.done()