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 func(n):
+    if n<=2:
         return 1
-    temp=sum_numbers(num-1)
-    return num+temp
-result=sum_numbers(100)
-print(result)
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+    else:
+        w=func(n-1)+func(n+1)
+        return w
+print(func(3))
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