save project

diy2.py

-def peach(n):
-    if n == 10:
+#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
         return 1
-    num = (peach(n+1)+1)*2
-    return num
+    tmp =  sum_numbers(num-1) #递出去
+    sum = tmp + num #归回来
+    return sum
 
 
-peach_num = peach(1)
-print(peach_num)
+print(sum_numbers(20))
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