无法使用 Python3 访问 .csv 文件中的值？答案

【问题标题】：Unable to access the values from the .csv file using Python3?无法使用 Python3 访问 .csv 文件中的值？
【发布时间】：2020-04-12 16:33:38
【问题描述】：

使用以下 Python3 代码，我可以访问第一列的值，但无法访问后续列。错误是：

IndexError: 列表索引超出范围

with open('smallSample.txt', 'r') as file:
    listOfLines = file.readlines()
    for line in listOfLines:
        print(line.strip())   
    header = listOfLines[0] #with all the labels
    print(header.strip().split(','))
    for row in listOfLines[1:]:
        values = row.strip().split(',')
        print(values[0]) #Able to access 1st row elements
        print(values[1]) #ERROR Unable to access the Second Column Values
        '''IndexError: list index out of range'''

存储的smallSample.txt数据为：

Date,SP500,Dividend,Earnings,Consumer Price Index,Long Interest Rate,Real Price,Real Dividend,Real Earnings,PE10

1/1/2016,1918.6,43.55,86.5,236.92,2.09,2023.23,45.93,91.22,24.21

2/1/2016,1904.42,43.72,86.47,237.11,1.78,2006.62,46.06,91.11,24

3/1/2016,2021.95,43.88,86.44,238.13,1.89,2121.32,46.04,90.69,25.37```

【问题讨论】：

如果您需要我方面的任何意见，请发表评论。
请修正你的错误和伴随它的散文。
您是否尝试过调试并查看要拆分的内容？
第 11 行输出：print(values)
[''] ['1/1/2016', '1918.6', '43.55', '86.5', '236.92', '2.09', '2023.23', '45.93', '91.22', '24.21'] [''] ['2/1/2016', '1904.42', '43.72', '86.47', '237.11', '1.78', '2006.62', '46.06', '91.11', '24'] [''] ['3/1/2016', '2021.95', '43.88', '86.44', '238.13', '1.89', '2121.32', '46.04', '90.69', '25.37']

标签： python python-3.x csv data-science

【解决方案1】：

实际上，您的values 不是列表。它在for 循环中一次又一次地重新初始化。使用此代码：

with open('data.txt', 'r') as file:
    listOfLines = file.readlines()
    for line in listOfLines:
        print(line.strip())   
    header = listOfLines[0] #with all the labels
    print(header.strip().split(','))
    values = []   # <= look at here
    for row in listOfLines[1:]:
        values.append(row.strip().split(',')) # <= look at here
    print(values[0])  # <= outside for loop
    print(values[1])

【讨论】：

【解决方案2】：

with open('SP500.txt', 'r') as file:
    lines = file.readlines()
    #for line in lines:
        #print(line)
    #header = lines[0]
    #labels = header.strip().split(',')
    #print(labels)
    listOfData = []
    totalSP = 0.0
    for line in lines[6:18]:
        values = line.strip().split(',')
        #print(values[0], values[1], values[5])
        totalSP = totalSP + float(values[1])
        listOfData.append(float(values[5]))

    mean_SP = totalSP/12.0
    #print(listOfData)
    max_interest = listOfData[0]
    for i in listOfData:
        if i>max_interest:
            max_interest = i

【讨论】：