save project

diy1.py

@@ -3,3 +3,10 @@
 #要求这个函数能计算1+2+3+……+num的结果
 
 
+def sum_numbers(n):
+    if n==1:
+        return 1
+    value = sum_numbers(n-1)+n
+    return value
+    
+print(sum_numbers(9))
\ No newline at end of file