累计
In [5]: def sun_he(n):
...: sum = 0
...: for i in range(1,n+1):
...: sum+=i
...: print(sum)
In [6]: sun_he(100)
5050
累计
In [5]: def sun_he(n):
...: sum = 0
...: for i in range(1,n+1):
...: sum+=i
...: print(sum)
In [6]: sun_he(100)
5050