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diy1.py

@@ -2,9 +2,11 @@
 #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
+    temp = sum_numbers(num - 1)
+    return num + temp
 a=int(input())
-b=a
-for i in range(a):
-    b-=1
-    a=a+b
-print(a)
\ No newline at end of file
+result = sum_numbers(a)
+print(result)
\ No newline at end of file