diff --git a/diy1.py b/diy1.py
index 0735a44..17bcdb6 100644
--- a/diy1.py
+++ b/diy1.py
@@ -1,5 +1,9 @@
 #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
+    else:
+        return num+ sum_numbers(num-1) 
+print(sum_numbers(10))
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