save project

my_tree.py

@@ -3,8 +3,99 @@ import random
 
 
 def tree(n):
 def tree(n):
     if n>=0:
     if n>=0:
-    pen = turtle.Turtle()
-    pen.color('sienna')
+        pen.forward(n)
+        pen.right(30)
+        tree(n-10)
+        pen.left(60)
+        tree(n-10)
+        pen.right(30)
+        pen.up()
+        pen.backward(n)
+        pen.down()
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 # 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
@@ -16,3 +107,6 @@ pen.backward(150)    # 后退
 pen.down()
 pen.down()
 
 
 turtle.done()
 turtle.done()
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