Open a List of Files

[Paul Hankin]

On Jan 9, 2:41 am, Tim Chase <python.l... at tim.thechases.com> wrote:
> > I decided that I was just trying to be "too smooth by 1/2" so I fell back to
>
> > messages = open(os.path.join(host_path,'messages.txt'), 'wb')
> > deliveries = open(os.path.join(host_path,'deliveries.txt'), 'wb')
> > actions = open(os.path.join(host_path,'actions.txt'), 'wb')
> > parts = open(os.path.join(host_path,'parts.txt'), 'wb')
> > recipients = open(os.path.join(host_path,'recipients.txt'), 'wb')
> > viruses = open(os.path.join(host_path,'viruses.txt'), 'wb')
> > esp_scores = open(os.path.join(host_path,'esp_scores.txt'), 'wb')
>
> Another way to write this which reduces some of the code would be
>
>   filenames = ['messages', 'deliveries', 'actions', 'parts',
>     'recipients', 'viruses', 'esp_scores']
>
>   (messages, deliveries, actions, parts,
>     recipients, viruses, esp_scores) = [
>     open(os.path.join(host_path, '%s.txt' % fn), 'wb')
>     for fn in filenames
>     ]
>
> It becomes even more clear if you make an intermediate "opener"
> function such as
>
>   binwriter = lambda fname: open(
>       os.path.join(host_path, '%s.txt' % fname), 'wb')
>
>   (messages, deliveries, actions, parts,
>     recipients, viruses, esp_scores) = [
>     binwriter(fn) for fn in filenames]

This can be more cleanly written using locals()

for fn in filenames:
    locals()[fn] = open(os.path.join(host_path, fname + '.txt', 'wb')

--
Paul Hankin