提取.csv文件的列并找到它们的索引

Question

我有一个很大的csv文件，我想获取它中的所有值，这些值存储在我知道名称的特定列中。

不知怎的，我不明白它是如何做到这一点，但我想我靠近:(

import codecs 
import csv 
import json 
import pprint 
import re 


FIELDS = ["name", "timeZone_label", "utcOffset", "homepage","governmentType_label", "isPartOf_label", "areaCode", "populationTotal", 
     "elevation", "maximumElevation", "minimumElevation", "populationDensity", "wgs84_pos#lat", "wgs84_pos#long", 
     "areaLand", "areaMetro", "areaUrban"] 

index=[] 

with open('/Users/stephan/Desktop/cities.csv', "r") as f: 
    mycsv=csv.reader(f) 
    results=[] 
    headers=None 
    for row in mycsv: 
     for i, col in enumerate(row): 
      if col in FIELDS: 
       index.append(i) 
     print row[i]  
print index    

我的目录索引，是正确的，我认为，给我正确的价值观（列索引）

我有什么要添加到我的代码，使其工作

Answer 1

import csv 

with open('/Users/stephan/Desktop/cities.csv', "r") as f: 
    mycsv = csv.DictReader(f) 
    for row in mycsv: 
     for col in FIELDS: 
      try: 
       print(row[col]) 
      except KeyError: 
       pass 

Answer 2

如果您正在寻找在FIELDS这些列打印出所有的值，你想要做的是：

for row in mycsv: 
    for i, col in enumerate(row): 
     # If this is the header row entry for one of the columns we want, save its index value 
     if col in FIELDS: 
      index.append(i) 
     # If this is one of the columns in FIELDS, print its value 
     elif i in index: 
      print col