如何在Python中从文本文件生成的嵌套列表中选择列表项

Question

我有一个文本文件说

Mash,25.50,108.00  
Enhanced,37.50,162.00  
Pellets,30.00,135.00  
Protein Plus,39.00,174.00  
Calcium Plus,39.00,174.00  

我把它写进了一份打印报表

def readfile():
    textlist = [line.split(',') for line in open("chookfood.txt", 'r')]
    print(','.join([str(lst) for lst in textlist]))

readfile()

它输出这个嵌套列表：

['Mash', '25.50', '108.00\n'],['Enhanced', '37.50', '162.00\n'],['Pellets', '30.00', '135.00\n'],['Protein Plus', '39.00', '174.00\n'],['Calcium Plus', '39.00', '174.00']

如何将print语句转换为print mash[1]。我无法将这些值存储在python idle中，因此我需要一些方法来询问如何从mash打印25.50？你知道吗

Answer 1

如果它们是逗号分隔的值，请使用^{}模块：

import csv

with open('chookfood.txt') as chookfood:
    rows = csv.reader(chookfood)
    for row in rows:
        print(row[1])