ValueError: I/O operation on closed file

[San]

Hi Gorup,

why i am getting "ValueError: I/O operation on closed file" this error.
Pls let me know.

Thanks in Advance.
san

[Joel Goldstick]

On Wed, May 25, 2016 at 8:29 AM, San <sant...@gmail.com> wrote:
> Hi Gorup,
>
> why i am getting "ValueError: I/O operation on closed file" this error.
> Pls let me know.

Because your program is incorrect?

Why not list your code, so that someone might be able to help you?


>
> Thanks in Advance.
> san
> --
> https://mail.python.org/mailman/listinfo/python-list



--
Joel Goldstick
http://joelgoldstick.com/blog
http://cc-baseballstats.info/stats/birthdays

[alister]

because you are trying to do something with a file that has been closed

the error message is quite explanatory


--
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Friendship needs a certain parallelism of life, a community of thought,
a rivalry of aim.
-- Henry Brook Adams

[San]

Hello,
Following is the code i used.

def test_results(filename):
import csv
with open(filename,"rU") as f:
reader = csv.reader(f,delimiter="\t")
result = {}
for row in reader:
key = row[0]
if key in result:
result[row[0]].append(row[1])
else:
result[row[0]] = key
result[key]=row[1:]
print result

filename ='filename.csv'
test_results(filename)

[Rustom Mody]

I think your for needs to be indented in the with

[Steven D'Aprano]

On Thursday 26 May 2016 15:47, San wrote:

> Following is the code i used.
>
> def test_results(filename):
> import csv
> with open(filename,"rU") as f:
> reader = csv.reader(f,delimiter="\t")
> result = {}

You should use more consistent indents. Can you set your editor to
automatically use four spaces each time you hit the tab key?

In any case, you indent the "with" block. There are TWO lines indented, then
you outdent again. That means the with block completes and the file is closed.

You have:

def test_restults(filename):
...
with open(...) as f:
indented block
# f gets closed here
for row in reader:
indented block
print result



What you should have is:

def test_restults(filename):
...
with open(...) as f:
indented block
for row in reader:
indented block
# f gets closed here
print result


--
Steve