auto save

my_tree.py

 import turtle
 import turtle
-
+import random
+colors = ['snow','lightcoral']
+def tree(n):
+    if n>=0:
+        if n<=12:
+            pen.pensize(n/3)
+            c = random.choice(colors)
+            pen.pencolor(c)
+        else:
+            pen.pencolor('sienna')
+            pen.pensize(n/10)
+        pen.forward(n)
+        ang = random.randint(0,30)
+        len = random.randint(1,15)
+        pen.right(ang)
+        tree(n-len)
+        pen.left(2*ang)
+        tree(n-len)
+        pen.right(ang)
+        pen.up()
+        pen.backward(n)
+        pen.down()
 pen = turtle.Turtle()
 pen = turtle.Turtle()
 pen.color('sienna')
 pen.color('sienna')
+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
@@ -9,7 +31,8 @@ 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(150)    # 后退
+pen.backward(180)    # 后退
 pen.down()
 pen.down()
 
 
+tree(60)
 turtle.done()
 turtle.done()