Have a look on how you open the file to be imported:

python2:
open(filename, 'rb')

python3:
open(str(filename), 'r', encoding='utf-8'))

Hope, it helps!

Regards
Clemens

On Thursday, March 5, 2020 at 10:07:27 AM UTC+1, Andrew Rogers wrote:
>
> Hi
>
> I exported a CSV file using the Import/Export > 'export as csv file' 
> button found in the Database interface of web2py. That worked fine. 
>
> I then modified the exported file slightly - just changed the IDs.
>
> I then tried to import the modified file back into the table using the 
> 'import' button in the same area. But it fails with:
>
> <div>unable to parse csv file<pre>iterator should return strings, not 
> bytes (did you open the file in text mode?)</pre></div> ×
>
> What am i doing wrong?
>
> Thanks
> Andrew
>

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