排序列表在python中无法正常工作答案

【问题标题】：Sorted Lists not working properly in python排序列表在python中无法正常工作
【发布时间】：2019-05-31 02:48:00
【问题描述】：

我正在对一个包含 14 个标题和 500,000 条记录的 csv 文件进行排序。我使用 enumerate 函数组织了它们。但是，当我使用 sorted() 函数使用键值（例如：总利润）对它们进行排序时，它只返回 100,000 以下的数字（即 99,992.36，而实际上某些值达到数百万）。

当我切换到不同的关键值（例如：总成本）时，我遇到了同样的问题，但是如果该特定记录的总利润恰好超过 100,000，则该值会显示出来。所以我想我已经把它缩小到我的 sorted() 函数。

def processStats(originalList, header):

    #sorting in descending order
    sortedListByTotalProfit = sorted(originalList, key = operator.itemgetter(11), reverse = True)

    max_item = sortedListByTotalProfit[0]
    print(max_intem)

def main():
    fileName = 'Records.csv'
    records = []
    recordHeader = []    

    with open(fileName) as f:
        lines = f.readlines()
        for i, line in enumerate(lines):
            if i == 0: #first line is the header, store it in the list by splitting the first record by comma
                recordHeader=line.split(',') 
                continue
            records.append(line.split(",")) #takes each record in the file and stores elements separated by commas as elements of a list

    processStats(records, recordHeader)

【问题讨论】：

标签： python sortedlist

【解决方案1】：

我猜数据类型是字符串。您可以使用
records.append(list(map(int, line.split(","))))替换records.append(line.split(","))
所有代码：

def processStats(originalList, header):

    #sorting in descending order
    sortedListByTotalProfit = sorted(originalList, key = operator.itemgetter(11), reverse = True)

    max_item = sortedListByTotalProfit[0]
    print(max_intem)

def main():
    fileName = 'Records.csv'
    records = []
    recordHeader = []    

    with open(fileName) as f:
        lines = f.readlines()
        for i, line in enumerate(lines):
            if i == 0: #first line is the header, store it in the list by splitting the first record by comma
                recordHeader=line.split(',') 
                continue
            records.append(records.append(list(map(int, line.split(","))))) #takes each record in the file and stores elements separated by commas as elements of a list

    processStats(records, recordHeader)

【讨论】：