save project

my_tree.py

 import turtle
-import random
+
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
@@ -13,24 +13,15 @@ pen.backward(302)    # 后退
 pen.down()
 
 def tree(n):
-    if n>=0:
-        if n<=12:
-            color=random.choice(['snow','lightcoral','lightgreen','green','darkgreen','yellow','red','pink'])
-            pen.color(color)
-            pen.pensize(n/3)
-        else:
-            pen.color('sienna')
-            pen.pensize(n/10)
-        angle=random.random()
-        length=random.random()
+    if n>=15:
         pen.forward(n)
-        pen.right(30*angle)
-        tree(n-15*length)
-        pen.left(60*angle)
-        tree(n-15*length)
-        pen.right(30*angle)
+        pen.right(30)
+        tree(n-20)
+        pen.left(60)
+        tree(n-20)
+        pen.right(30)
         pen.up()
         pen.backward(n)
         pen.down()
-tree(60)
+tree(152)
 turtle.done()