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将 csv 文件的内容作为列表检索的最佳和最优雅的方法是什么？请注意，国家、地区和人口等所需的列将在下面的程序中自动识别。

with open ('data.csv','r') as infile:
    contents = infile.read().split(',')

with open ('data.csv','r') as infile:
    countries = [item.split(',')[contents.index('Country')] for item in infile]

with open ('data.csv','r') as infile:
    areas = [item.split(',')[contents.index('Area')] for item in infile]

with open ('data.csv','r') as infile:
    populations = [item.split(',')[contents.index('Population')] for item in infile]

print (countries)
print (areas)
print (populations)

上面的程序有效，但正在寻找非常短且易读的程序。

更新：为防止某些文件中不存在某些列（例如“国家”）时出现错误，可以通过以下方式改进程序：

countries = [item.split(',')[contents.index('Country')] for item in infile if 'Country' in contents]

如何使用 csv 模块完成？

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1 回答 1

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将csv模块用于 CSV 文件：

import csv

countries = []
areas = []
populations = []

with open ('data.csv', newline='') as infile:
    reader = csv.DictReader(infile)
    for row in reader:
        countries.append(row['Country'])
        areas.append(row['Area'])
        populations.append(row['Population'])

该类DictReader()自动使用第一行标题作为文件其余部分的键。

或使用：

import csv

with open ('data.csv', newline='') as infile:
    reader = csv.reader(infile)
    next(reader, None)  # skip the header first
    countries, areas, populations = zip(*reader)

如果您只有 3 列，即国家、地区和人口，按此顺序排列。

于 2013-11-10T14:56:04.153 回答