用python搜索和比较csv文件中的值

Question

我有两个 csv 文件 - 一个主文件和一个更新文件。我想从更新文件中获取特定列，并根据主文件检查值。

两个文件将具有相同的列并且大致如下所示：

Listed Company's English Name,Listed Company's Chinese Name,Stock Code,Listing Status,Director's English Name,Director's Chinese Name,Capacity,Position,Appointment Date (yyyy-mm-dd),Resignation Date (yyyy-mm-dd)  
C.P. Lotus Corporation,________,00122,Current,CHEARAVANONT Dhanin,___,Executive Director,,2009-12-31,
C.P. Lotus Corporation,________,00121,Current,CHEARAVANON Narong,___,Executive Director,,2001-02-01,  
C.P. Lotus Corporation,________,00121,Current,CHEARAVANONT Soopakij,___,Executive Director,CEO,2000-04-14,  

基本上，我想遍历更新文件，从更新文件中获取每个股票代码值并检查它是否存在于主文件中。

然后，对于每个匹配的股票代码，我需要检查 Director 名称值的差异，跟踪那些不匹配的。

我遵循了这个例子，但它似乎并没有完全满足我的需求（或者我不完全理解它......）：Python: Comparing two CSV files and searching for similar items

f1 = file(csvHKX, 'rU')
f2 = file(csvWRHK, 'rU')
f3 = file('results.csv', 'w')

csv1 = csv.reader(f1)
csv2 = csv.reader(f2)
csv3 = csv.writer(f3)

scode = [row for row in csv2]

for hkx_row in csv1:
  for wrhk_row in scode:
    if hkx_row[2] != wrhk_row[2]:
      print 'HKX:', hkx_row
    continue

f1.close()
f2.close()
f3.close()

更新文件包含以下股票代码：“00121”和“01003”（用于测试）。

似乎代码正在遍历列表，比较每一行并打印出一行，如果股票代码与行不匹配。因此，当第一列读取“00121”时，它会打印出包含“01003”的行，反之亦然。

但我只对在 wrhk_row[2] 中找不到 hkx_row[2] ANYWHERE 时感兴趣

Answer 1

这对你有帮助吗？ ：

文件 ma​​ster.csv

Listed Company's English Name,Listed Company's Chinese Name,Stock Code,Listing Status,Director's English Name,Director's Chinese Name,Capacity,Position,Appointment Date (yyyy-mm-dd),Resignation Date (yyyy-mm-dd)  
C.P. Lotus Corporation,________,00122,Current,CHEARAVANONT Dhanin,___,Executive Director,,2009-12-31,
C.P. Lotus Corporation,________,00121,Current,CHEARAVANON Narong,___,Executive Director,,2001-02-01,  
C.P. Lotus Corporation,________,00121,Current,CHEARAVANONT Soopakij,___,Executive Director,CEO,2000-04-14,  
C.P. Lotus Corporation,________,00123,Current,DEANINO James,___,Pilot,,2009-06-25,
C.P. Lotus Corporation,________,00129,Current,GINGE Ivy,___,Dental Technician,,2010-07-27,
C.P. Lotus Corporation,________,00127,Current,ERATOR Jane,___,Engineer,,2005-12-04,
C.P. Lotus Corporation,________,00119,Current,FIELD Mary,___,Pastrycook,,2009-06-25,

文件update.csv

Listed Company's English Name,Listed Company's Chinese Name,Stock Code,Listing Status,Director's English Name,Director's Chinese Name,Capacity,Position,Appointment Date (yyyy-mm-dd),Resignation Date (yyyy-mm-dd)  
C.P. Lotus Corporation,________,00133,Current,THOMPSON Sarah,___,Cosmonaut,,2004-01-20,
C.P. Lotus Corporation,________,00122,Current,CHEARAVANONT Dhanin,___,Executive Director,,2009-12-31,
C.P. Lotus Corporation,________,00121,Current,CHEARAVANON Narong,___,Executive Director,,2001-02-01,  
C.P. Lotus Corporation,________,00121,Current,BEARD Sophia,___,Executive Director,CEO,2010-04-26,   
C.P. Lotus Corporation,________,00127,Current,ERATOR Jane,___,Engineer,,2005-12-04,
C.P. Lotus Corporation,________,00129,Current,MISTOUKI Hassan,___,Folk Singer,,2010-07-27,

代码

import csv

mas = csv.reader(open('master.csv','rb'))
upd = csv.reader(open('update.csv','rb'))

set24 = set((row[2],row[4]) for row in mas)
print set24
print

updkept = [ row for row in upd if (row[2],row[4]) not in set24]
print '\n'.join(map(str,updkept))

结果

set([('00127', 'ERATOR Jane'), ('00121', 'CHEARAVANONT Soopakij'), ('00121', 'CHEARAVANON Narong'), ('00119', 'FIELD Mary'), ('00122', 'CHEARAVANONT Dhanin'), ('Stock Code', "Director's English Name"), ('00129', 'GINGE Ivy'), ('00123', 'DEANINO James')])

['C.P. Lotus Corporation', '________', '00133', 'Current', 'THOMPSON Sarah', '___', 'Cosmonaut', '', '2004-01-20', '']
['C.P. Lotus Corporation', '________', '00121', 'Current', 'BEARD Sophia', '___', 'Executive Director', 'CEO', '2010-04-26', '   ']
['C.P. Lotus Corporation', '________', '00129', 'Current', 'MISTOUKI Hassan', '___', 'Folk Singer', '', '2010-07-27', '']