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

[Maciej Fijalkowski]

On Wed, Feb 13, 2013 at 7:33 PM, MRAB <python at mrabarnett.plus.com> wrote:
> On 2013-02-13 13:23, Lennart Regebro wrote:
>>
>> On Wed, Feb 13, 2013 at 1:10 PM, Serhiy Storchaka <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.
>>
>>
>> This has the benefit of being slow both on CPython and PyPy. Although
>> using .format() is even slower. :-)
>>
> How about adding a class method for catenation:
>
>     str.cat(a, b, c, d)
>     str.cat([a, b, c, d]) # Equivalent to "".join([a, b, c, d])
>
> Each argument could be a string or a list of strings.
>
>
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I actually wonder.

There seems to be the consensus to avoid += (to some extent). Can
someone commit the change to urrllib then? I'm talking about reverting
http://bugs.python.org/issue1285086 specifically