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
+color=["white",'lightcoral']
 
 # 移动到起点
 pen.left(90)
@@ -12,16 +14,24 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 def tree(n):
-    if n >= 50:
+    if n >= 0:
+        pen.pensize(n/10)
+        if n <= 9:
+            c = random.randint(0,1)
+            pen.pencolor(color[c])
+            pen.pensize(n/3)
+        else:
+            pen.pencolor('sienna')
         pen.forward(n)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
+        a = random.randint(0,30)
+        l = random.randint(1,15)
+        pen.right(a)
+        tree(n-l)
+        pen.left(2*a)
+        tree(n-l)
         pen.penup()
-        pen.right(30)
+        pen.right(a)
         pen.backward(n)
         pen.pendown()
-
-tree(100)
+tree(50)
 turtle.done()