save project

my_tree.py

 import turtle
+import random
 
 pen = turtle.Turtle()
 pen.color('sienna')
+pen.speed("fastest")
 # 画布大小
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
@@ -9,25 +11,35 @@ w.bgcolor('wheat')      # wheat小麦
 # 移动到起点
 pen.left(90)
 pen.up()
-pen.backward(150)    # 后退
+pen.backward(200)    # 后退
 pen.down()
 def tree(n):
-    if n>=50:
+    if n>=0:
+        if n<=12:
+            pen.pensize(n/2)
+            pen.pencolor(random.choice(["snow","lightcoral","pink"]))
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
+        angle=random.randint(0,30)
+        length=random.randint(1,10)
         pen.forward(n)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
+        pen.right(angle)
+        tree(n-length)
+        pen.left(angle*2)
+        tree(n-length)
+        pen.right(angle)
         pen.up()
         pen.backward(n)
         pen.down()
-        
+            
+
 
         
 
+        
 
-tree(100)
+tree(60)
 
 
 turtle.done()