Python ValueError : 关闭文件的 I/O 操作
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时间：2020-08-19 12:23:35 来源:igfitidea点击:
ValueError : I/O operation on closed file
提问by GobSmack
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, pis a dictionary, wand cboth are strings.
这里，p是一本字典，w并且c都是字符串。
When I try to write to the file it reports the error:
当我尝试写入文件时，它报告错误：
ValueError: I/O operation on closed file.
采纳答案by falsetru
Indent correctly; your forstatement should be inside the withblock:
正确缩进；你的for语句应该在with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)
Outside the withblock, the file is closed.
在with块之外，文件被关闭。
>>> with open('/tmp/1', 'w') as f:
... print(f.closed)
...
False
>>> print(f.closed)
True
回答by Slake
Same errorcan raise by mixing: tabs + spaces.
通过混合可以引发相同的错误：制表符 + 空格。
with open('/foo', 'w') as f:
(spaces OR tab) print f <-- success
(spaces AND tab) print f <-- fail
