save project

my_tree.py

 import turtle
-import 
-
+import random
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
@@ -10,18 +9,30 @@ w.bgcolor('wheat')      # wheat小麦
 # 移动到起点
 pen.left(90)
 pen.up()
-pen.backward(150)    # 后退
-pen.down()
-pen.forward(100)
-pen.right(30)
-pen.forward(50)
-pen.forward(-50)
-pen.up()
-pen.left(60)
+pen.backward(150)
 pen.down()
-pen.forward(50)
-pen.forward(-50)
-pen.right(30)
-pen.forward(-100)
 
+def tree(n):
+    if n>=0:
+        if n<=12:
+            color_list=["snow","lightcoral"]
+            color=random.choice(color_list)
+            pen.color(color)
+            pen.pensize(n/10)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
+        pen.forward(n)
+        r=random.random()
+        pen.right(30*r)
+        l=1.5*random.random()
+        tree(n-10*l)
+        pen.left(60*r)
+        tree(n-10*l)
+        pen.right(30*r)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+tree(60)
 turtle.done()
+