[Python-Dev] Usage of += on strings in loops in stdlib

[Serhiy Storchaka]

On 13.02.13 15:17, Daniel Holth wrote:
> On Wed, Feb 13, 2013 at 7:10 AM, Serhiy Storchaka <storchaka at gmail.com
> <mailto:storchaka at gmail.com>> wrote:
>     I prefer "x = '%s%s%s%s' % (a, b, c, d)" when string's number is
>     more than 3 and some of them are literal strings.
>
> Fixed: x = ('%s' *  len(abcd)) % abcd

No, you don't need this for the constant number of strings. Because 
almost certainly some of strings will be literals, you can write this in 
a more nice way. Compare:

     'config[' + key + '] = ' + value + '\n'
     ''.join(['config[', key, '] = ', value, '\n'])
     'config[%s] = %s\n' % (key, value)