ValueError異常：在關閉的文件

Question

import csv  

with open('v.csv', 'w') as csvfile: 
    cwriter = csv.writer(csvfile, delimiter=' ', quotechar='|', quoting=csv.QUOTE_MINIMAL) 

for w, c in p.iteritems(): 
    cwriter.writerow(w + c) 

在這裏，p I/O操作是一本字典，w和c都是字符串。

當我嘗試在文件中寫報告錯誤：

ValueError : I/O operation on closed file. 

幫助我，我真的很新的Python。我正在與Python 2.7.3 預先感謝您。

Answer 1

正確縮進; for的說法應該是裏面with塊：

import csv  

with open('v.csv', 'w') as csvfile: 
    cwriter = csv.writer(csvfile, delimiter=' ', quotechar='|', quoting=csv.QUOTE_MINIMAL) 

    for w, c in p.iteritems(): 
     cwriter.writerow(w + c) 

外with塊，文件被關閉。

>>> with open('/tmp/1', 'w') as f: 
...  print f.closed 
... 
False 
>>> print f.closed 
True