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我有一個CSV文件,其中有超過100k條記錄,並且在該記錄中,一列中的值以逗號分隔,我想對該逗號分隔值進行排序。ValueError:關閉的文件上的I/O操作
的樣本數據:
"PT3QB789TSUIDF371261","THE TORONTO,DOMINION BANK","HZSN7FQBPO5IEWYIGC72","MAS,CA.ON.OSC,ASIC*,AAAA","XVCCCCCCCCCCYYUUUUU"
"11111111111111111111","ABC,XYZ,QWE","HZSN7FQBPO5IEWYIGC72","POU,ABC,MAS,CA.QC.OSC,CA.ON.OSC","XVRRRRRRRRTTTTTTTTTTTTT"
"22222222222222222222","BHC,NBC,MKY","HZSN7FQBPO5IEWYIGC72","BVC,AZX,CA.SK.FCAA,CA.NL.DSS","QQQQQQQQQRRCGHDKLKSLS"
正如你可以看到有列2和4是有逗號分隔值列,但我想只有4個值進行排序。 所以我的輸出看起來應該如下:
"PT3QB789TSUIDF371261","THE TORONTO,DOMINION BANK","HZSN7FQBPO5IEWYIGC72","AAAA,ASIC*,CA.ON.OSC,MAS","XVCCCCCCCCCCYYUUUUU"
"11111111111111111111","ABC,XYZ,QWE","HZSN7FQBPO5IEWYIGC72","ABC,CA.ON.OSC,CA.QC.OSC,MAS,POU","XVRRRRRRRRTTTTTTTTTTTTT"
"22222222222222222222","BHC,NBC,MKY","HZSN7FQBPO5IEWYIGC72","AZX,BVC,CA.NL.DSS,CA.SK.FCAA","QQQQQQQQQRRCGHDKLKSLS"
,我想寫的代碼如下:
#!/usr/bin/python
import csv
OUT_FILE = '/proj/ctc/temp/sanjay/REC-754/2017-05-29_IR_Position_Report_US_US_2017-05-30_out.csv'
IN_FILE = '/proj/ctc/temp/sanjay/REC-754/2017-05-29_IR_Position_Report_US_US_2017-05-30.csv'
f = open(IN_FILE, 'r')
o = open(OUT_FILE,'w')
with f:
reader = csv.reader(f)
with o:
writer = csv.writer(o)
for row in reader:
reportable_jurisdiction=row[68]
if ',' in reportable_jurisdiction:
row[68]=sorted(list(row[68].split(',')))
print " reportable Jurisdiction with comma "+reportable_jurisdiction
else:
print "reportable Jurisdiction if single "+reportable_jurisdiction
if(f.closed):
f=open(IN_FILE,"r")
if(o.closed):
o=open(OUT_FILE,"w")
writer.writerow(row)
print(row)
,但是當我執行這個python腳本我得到以下錯誤:
$./Csvreader2.py
Traceback (most recent call last):
File "./Csvreader2.py", line 15, in <module>
for row in reader:
ValueError: I/O operation on closed file
我走出這個問題和問題是與代碼 的縮進,但我得到了新的問題
Traceback (most recent call last):
File "./Csvreader2.py", line 14, in <module>
reportable_jurisdiction=row[68]
IndexError: list index out of range
在我的CSV文件中有100多列,但爲什麼會出現此錯誤?
縮進你的代碼。您需要保持文件處於打開狀態,直到完成讀取操作爲止,'csv.reader()'不會將所有數據存入內存,您需要保持文件處於打開狀態。 –
感謝您的輸入..代碼以相同的方式縮進。但問題仍然一樣。 – user2779202
是的,我是說問題出在你的縮進上。這是錯誤的。您需要將第二個'with'語句縮進到與'reader ='相同的級別,或者將這兩個'with'語句合併爲一個。你的第一個'with'語句*結束*並且關閉'f'。 –