Python 2.7 Python 2.7:索引器：列表索引超出范围

我试图打开一个csv文件，并将值从字符串转换为整数，以便对列表进行排序。我收到的结果是：

“[[]、['190']、['200']、['250']、['350']、['90']]”

这是我的原始代码

import csv

def bubbleSort(scores):
    for length in range(len(scores)-1,0,-1):
        for i in range(length):
            if scores[i]>scores[i+1]:
                temp = scores[i]
                scores[i] = scores[i+1]
                scores[i+1] = temp


with open ("rec_Scores.csv", "rb") as csvfile:
    r = csv.reader(csvfile)
    scores = list(r)


bubbleSort(scores)
print(scores)

我尝试在行中添加：

scores_int = [int(score[0]) for score in scores]

但是，现在我收到错误“IndexError:列表索引超出范围”

以下是我正在使用的代码的当前版本：

import csv

def bubbleSort(scores):
    for length in range(len(scores)-1,0,-1):
        for i in range(length):
            if scores[i]>scores[i+1]:
                temp = scores[i]
                scores[i] = scores[i+1]
                scores[i+1] = temp


with open ("rec_Scores.csv", "rb") as csvfile:
    r = csv.reader(csvfile)
    scores = list(r)
    scores_int = [int(score[0]) for score in scores]


bubbleSort(scores_int)
print(scores_int)

如果有人能帮我解决目前的问题，我将不胜感激。谢谢。

如果csv文件逐行包含数字，则此代码正常工作（python 2.7），如下所示：

 190
 200
 250
 350
 90

---

但它没有对数字进行排序