用python怎么做呀

编写程序计算如下数列的值:

1-2+3-4...-200中，所有数字为整数，从1开始递增，奇数

为正，偶数为负，

newList = []
for i in range(1,201):
  if i % 2 == 0:
    newList.append("-"+str(i))
  else:
    newList.append(str(i))
newIntList = [int(i) for i in newList]
print(newIntList)
print(sum(newIntList))

s = 0
flag = -1
for i in range(1, 201):
    flag *= -1
    s += flag * i

print(s)
"""--result
-100
"""