ValueError : 关闭文件的 I/O 操作 [英] ValueError : I/O operation on closed file

问题描述

导入csv使用 open('v.csv', 'w') 作为 csvfile:cwriter = csv.writer(csvfile, delimiter='', quotechar='|', quoting=csv.QUOTE_MINIMAL)对于 p.items() 中的 w、c:cwriter.writerow(w + c)

这里，p 是字典，w 和 c 都是字符串.

当我尝试写入文件时，它报告错误:

ValueError: 关闭文件的 I/O 操作.

解决方案

缩进正确；您的 for 语句应该在 内与块:

导入csv使用 open('v.csv', 'w') 作为 csvfile:cwriter = csv.writer(csvfile, delimiter='', quotechar='|', quoting=csv.QUOTE_MINIMAL)对于 p.items() 中的 w、c:cwriter.writerow(w + c)

在 with 块之外，文件被关闭.

<预><代码>>>>with open('/tmp/1', 'w') as f:...打印(f.关闭)...错误的>>>打印(f.关闭)真的

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)

Here, p is a dictionary, w and c both are strings.

When I try to write to the file it reports the error:

ValueError: I/O operation on closed file.

解决方案

Indent correctly; your for statement should be inside the with block:

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)

Outside the with block, the file is closed.

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

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