save project

diy1.py

-#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:
+def x(n):
+    if n<=2 :
         return 1
-    temp = Sum_Numbers(num-1)
-    return num + temp
-
-end  =Sum_Numbers(2)
-print(end)
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+    if n>2:
+        end = x(n-1)+x(n-2)
+        return end
+a = x(6)
+print(a)
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