slightly OT: Python BootCamp

[Neil Cerutti]

On 2009-12-04, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> wrote:
> How would I re-write this? Just get rid of the try block and
> add a close:
>
> for (exten, list) in files.iteritems():
>     f=open('extensions-%s.txt' % exten,'w')
>     f.write('\n'.join(list))

"\n".join is a cute shortcut, but if you use it you must remember
to write the last, trailing '\n' manually.

> That's still not quite "best practice" -- best practice would
> be to use a with block, but (to my shame) I'm not entirely
> familiar with that so I'll leave it for others.

from __future__ import with_statement

# Etc.

for (exten, list) in files.iteritems():
    with open('extensions-%s.txt' % exten,'w') as f:
        f.write('\n'.join(list))
        f.write('\n')

-- 
Neil Cerutti