python - 类型错误: '_io.TextIOWrapper' 对象不可订阅

Question

代码应该做的主要功能是打开文件并获取中位数。这是我的代码:

def medianStrat(lst):
    count = 0
    test = []
    for line in lst:
        test += line.split()
        for i in lst:
            count = count +1
            if count % 2 == 0:
                x = count//2
                y = lst[x]
                z = lst[x-1]
                median = (y + z)/2
                return median
            if count %2 == 1:
                x = (count-1)//2
                return lst[x]     # Where the problem persists

def main():
    lst = open(input("Input file name: "), "r")
    print(medianStrat(lst))

这是我得到的错误:

Traceback (most recent call last):
  File "C:/Users/honte_000/PycharmProjects/Comp Sci/2015/2015/storelocation.py", line 30, in <module>
    main()
  File "C:/Users/honte_000/PycharmProjects/Comp Sci/2015/2015/storelocation.py", line 28, in main
    print(medianStrat(lst))
  File "C:/Users/honte_000/PycharmProjects/Comp Sci/2015/2015/storelocation.py", line 24, in medianStrat
    return lst[x]
TypeError: '_io.TextIOWrapper' object is not subscriptable

我知道 lst[x] 导致了这个问题，但不太确定如何解决这个问题。那么这个问题的解决方案是什么，或者可以做些什么来使代码正常工作？

Answer 1

您不能索引 ( __getitem__ ) _io.TextIOWrapper目的。你可以做的是使用 a list of lines .在您的代码中试试这个:

lst = open(input("Input file name: "), "r").readlines()

---

此外，您没有关闭 file 对象，这样会更好:

with open(input("Input file name: ", "r") as lst:
    print(medianStrat(lst.readlines()))

with确保文件被关闭。