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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:
+def dog(n):
+    if n == 10:
         return 1
-    he = sum_numbers(num)+sum_numbers(num-1)
+    he = dog(n+1)*2+1
     return he
-print(sum_numbers(2))        
+print(dog(2))
+
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+