auto save

my_tree.py

 import turtle
 import turtle
-
-pen = turtle.Turtle()
-pen.color('sienna')
-# 画布大小
+import  random
+pen=turtle.Turtle()
+pen.color("sienna")
 w = turtle.Screen()
 w = turtle.Screen()
-w.bgcolor('wheat')      # wheat小麦
+w.bgcolor("wheat")
 
 
-# 移动到起点
 pen.left(90)
 pen.left(90)
 pen.up()
 pen.up()
-pen.backward(150)    # 后退
+pen.backward(150)
 pen.down()
 pen.down()
+pen.speed(0)
 
 
-turtle.done()
+def tree(n):
+    if n>=0:
+        if n<=12:
+            color=random.choice(["snow","lightcoral"])
+            pen.color(color)
+            pen.pensize(n/3)
+        else:    
+            pen.pensize(n/10)
+            pen.color("sienna")
+        pen.forward(n)
+        angle=random.randint(0,30)
+        length=random.randint(0,15)
+        pen.right(angle)
+        tree(n-length)
+        pen.left(2*angle)
+        tree(n-length)
+        pen.right(angle)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+tree(60)        
+turtle.done()
\ No newline at end of file