无法确切地找出原因，但此代码完全按预期工作，直到我尝试打印导致 test2 的 TypeError: float' object is not subscriptable。不管我做什么样的数学运算或 test 的内容，我仍然得到同样的错误。

问题代码：

with open("InputFileData.csv") as file:
   SampleTotalHours = file.readlines();

TotalHours = []

for element in SampleTotalHours:
   hoursAsStrings = element.split(',')
   hoursAsFloats = [float(hourString) for hourString in hoursAsStrings]
   TotalHours.append(sum(hoursAsFloats))

EmployeeNumber = 4
i = 0

TotalHoursInt = []
TotalHoursInt = TotalHours

test = [11,12,13]
test2 = TotalHoursInt[1] + test[1]
print(test2[1])

内容“InputFileData.csv”：

40.1,39.7,40,38
36,36,35.5,35.8
40,41.6,40.3,40
20.4,22.8,20,20

输出：

TypeError:float' object is not subscriptable