save project

diy1.py

-#定义一个函数sum_numbers()
-#要求这个函数能接收一个名为num的整型参数
-#要求这个函数能计算1+2+3+……+num的结果
-# def sum_numbers(num):
-#     if num==1:
-#         return 1
-#     new_num=sum_numbers(num-1)+num
-#     return new_num
-# print(sum_numbers(1000))
 import turtle
+
+def tree(n):
+    if n>=50:
+        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()
+
 pen=turtle.Pen()
 pen.color("sienna")
 w=turtle.Screen()
 w.bgcolor("wheat")
 pen.left(90)
 pen.up()
-pen.backward(150)
-pen.down()
-pen.forward(100)
-pen.right(30)
-pen.forward(50)
-pen.up()
-pen.backward(50)
-pen.down()
-pen.left(60)
-pen.forward(50)
-pen.up()
-pen.backward(50)
-pen.down()
-pen.right(30)
-pen.up()
 pen.backward(100)
 pen.down()
+tree(100)
 turtle.done()