ValueError:对关闭的文件进行I / O操作


109
import csv    

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

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

这里,p是一本字典,w并且c都是字符串。

当我尝试写入文件时,它报告错误:

ValueError: I/O operation on closed file.

Answers:


157

正确缩进;您的for陈述应在with区块内:

import csv    

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

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

with块外部,文件已关闭。

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

6

混合使用:制表符+空格会引起相同的错误

with open('/foo', 'w') as f:
 (spaces OR  tab) print f       <-- success
 (spaces AND tab) print f       <-- fail

1
是的,但是当将它们混合在一起时,在python中总是这样吗?
Nebulosar
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