save project

diy1.py

@@ -3,3 +3,9 @@
 #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
+    sum=sum_numbers(num)=num+sum_numbers(num-1)
+    return  sum
+a=
\ No newline at end of file