save project

diy1.py

@@ -3,4 +3,9 @@
 #要求这个函数能计算1+2+3+……+num的结果
 
 def sum_numbers(num)
-    if 
\ No newline at end of file
+    if num ==1:
+        return 1
+    sum=sum_numbers(num-1) 
+    return sum+num
+a = sum_numbers(2)
+print(a)
\ No newline at end of file