save project

my_tree.py

 import turtle
+from random import randint
+import random
 
 pen = turtle.Turtle()
 pen.color('sienna')
@@ -6,22 +8,32 @@ pen.color('sienna')
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 
+color=["snow","lightcoral"]
+
 # 移动到起点
 pen.left(90)
 pen.up()
 pen.backward(150)    # 后退
 pen.down()
 def tree(n):
-    if n>=50:
+    if n>=0:
+        if n<=12:
+            pen.color(random.choice(color))
+            pen.pensize(n/3)
+        else:
+            pen.color("sienna")
+            pen.pensize(n/10)
         pen.forward(n)
-        pen.right(30)
-        tree(n/2)
-        pen.left(60)
-        tree(n/2)
-        pen.right(30)
+        angle=randint(0,30)
+        length=randint(1,15)
+        pen.right(angle)
+        tree(n-length)
+        pen.left(2*angle)
+        tree(n-length)
+        pen.right(angle)
         pen.up()
         pen.backward(n)
         pen.down()
 
-tree(100)
+tree(60)
 turtle.done()