[Tutor] Appending an extra column in a data file

[eryksun]

On Wed, Apr 10, 2013 at 5:49 PM, Oscar Benjamin
<oscar.j.benjamin at gmail.com> wrote:
>>     fin = open('old.dat')
>>     fout = open('new.dat', 'w')
>>
>>     with fin, fout:
>>         for line in fin:
>
> This has the same problems as contextlib.nested: An error raised while
> opening 'new.dat' could prevent 'old.dat' from being closed properly.

Thanks for pointing out the potential bug there. It's not a big
problem in this case with the file open for reading. But, yeah, I'm
hanging my head in shame here... ;)