save project

diy1.py

-def a(n):
-    if a == 5:
+#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
-    b = (a(n+1)+1)*2
-    return b
-a_b = a(b)
-print(a_b)
\ No newline at end of file
+    tmp =  sum_numbers(num-1) #递出去
+    sum = tmp + num #归回来
+    return sum
+
+print(sum_numbers(20))