Python从.csv打印某些列

时间:2014-10-28 22:06:57

标签: python csv export-to-csv

大家好,谢谢你的阅读。我正在尝试创建一个python脚本,它将快速打印出我的.csv

的某些列

数据库看起来像。

Song_Name,File_Name,Artist_Name,Artist_ID
Song1,filename1,artistname,artist001
Song1,filename1,artistname,artist001
Song1,filename1,artistname,artist001
Song1,filename1,artistname,artist001

我正在尝试创建一个只有

的新csv
Song_Name,Artist_ID
Song1,artist001
Song1,artist001
Song1,artist001
Song1,artist001

我正在使用此代码:

import csv

with open('convert.csv','rb') as i:
    with open('converted.csv','wb') as o:
        r = csv.DictReader(i)
        w = csv.DictWriter(o,'Song_Name Artist_ID'.split(),extrasaction='ignore')
        w.writeheader()
        for a in r:
            w.writerow(a)

结果是一个标题为转换的银行.csv。我做错了什么?

2 个答案:

答案 0 :(得分:2)

你可以使用Python petl库(Python Extract Transform Load) 让我们假设您在csv文件中有第一个表(您也可以使用petl直接从数据库加载)。然后你只需加载它并执行以下操作。

#Load the table
table1 = fromcsv('table1.csv')
# Alter the colums
table2 = cut(table1, 'Song_Name','Artist_ID')
#have a quick look to make sure things are ok.  Prints a nicely formatted table to your console
print look(table2)
# Save to new file
tocsv(table2, 'new.csv')

快来看看这个简介:http://petl.readthedocs.org/en/latest/case_study_1.html

答案 1 :(得分:1)

with open('convert.csv','r') as infile, open('converted.csv','w') as outfile:
    writer = csv.writer(outfile, delimiter=',')
    for row in csv.reader(infile):
        writer.writerow([row[0], row[-1]])