On Sun, Mar 25, 2012 at 9:06 AM, Dima Pasechnik <dimp...@gmail.com> wrote:
> OK, thanks for letting su know. It looks like a genuine bug, indeed.
> The issue is now reported to sagenb folks as
> https://github.com/sagemath/sagenb/issues/48
I think you should close that. The following works fine in the
notebook. It makes no sense to close the file -- instead, you have
to delete the csv writer object, which flushes it to the file.
import csv
output=csv.writer(open('test.csv','wb'))
data=[[1,2],[3,4],[5,6]]
for r in data:
output.writerow(r)
del output
>
>
> On Sunday, 25 March 2012 20:05:43 UTC+8, Vincent Knight wrote:
>>
>> Thanks for the answer Dima,
>> I tried this:
>>
>> -----
>>
>> import csv
>>
>> o=open('test.csv','wb')
>> output=csv.writer(o)
>>
>> data=[[1,2],[3,4],[5,6]]
>>
>> for r in data:
>> output.writerow(r)
>>
>> o.close()
>>
>> ----
>>
>> I'm afraid that that doesn't work either (still output an empty csv file).
>> Note that I have never had to use the close statement when running in python
>> or bash mode so I can only assume that it's an issue with the notebook...
>>
>> Vince
>>
>> On 25 March 2012 12:26, Dima Pasechnik <dimp...@gmail.com> wrote:
>>>
>>>
>>>
>>> On Sunday, 25 March 2012 18:21:23 UTC+8, Vincent Knight wrote:
>>>>
>>>> Hi all,
>>>>
>>>> I've had trouble with this for a while.
>>>>
>>>> If I write the following in to a notebook cell:
>>>>
>>>> ------
>>>> import csv
>>>>
>>>> output=csv.writer(open('test.csv','wb'))
>>>>
>>>> data=[[1,2],[3,4],[5,6]]
>>>>
>>>> for r in data:
>>>> output.writerow(r)
>>>>
>>>> -----
>>>
>>>
>>> Perhaps you should close() what what was open() ? I.e.
>>>
>>> o= open('test.csv','wb')
>>> output=csv.writer(o)
>>> # do the stuff....
>>> o.close()
>>>
>>>
>>>>
>>>>
>>>> and evaluate, a hyperlink appears entitled 'test.csv', if I open that
>>>> csv file it is empy. Checking the code in bash mode in sage (and python)
>>>> does however work (and create the required csv file).
>>>>
>>>> Am I missing something to do with the notebook?
>>>>
>>>> Thanks,
>>>> Vince
>>>>
>>>> PS I've tried this on the notebook running on my machine and sagenb as
>>>> well...
>>>>
>>>> --
>>>> Dr Vincent Knight
>>>> Cardiff School of Mathematics
>>>> Senghennydd Road,
>>>> Cardiff
>>>> CF24 4AG
>>>> (+44) 29 2087 5548
>>>> www.vincent-knight.com
>>>> @drvinceknight
>>>> Skype: drvinceknight
>>>>
>>> --
>>> To post to this group, send email to sage-support@googlegroups.com
>>> To unsubscribe from this group, send email to
>>> sage-support+unsubscr...@googlegroups.com
>>> For more options, visit this group at
>>> http://groups.google.com/group/sage-support
>>> URL: http://www.sagemath.org
>>
>>
>>
>>
>> --
>> Dr Vincent Knight
>> Cardiff School of Mathematics
>> Senghennydd Road,
>> Cardiff
>> CF24 4AG
>> (+44) 29 2087 5548
>> www.vincent-knight.com
>> @drvinceknight
>> Skype: drvinceknight
>>
>
--
William Stein
Professor of Mathematics
University of Washington
http://wstein.org
--
To post to this group, send email to sage-support@googlegroups.com
To unsubscribe from this group, send email to
sage-support+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/sage-support
URL: http://www.sagemath.org
