Le 09/08/2014 01:08, Steven D'Aprano a écrit :
On Fri, Aug 08, 2014 at 10:20:37PM -0400, Alexander Belopolsky wrote:
On Fri, Aug 8, 2014 at 8:56 PM, Ethan Furman wrote:
I don't use sum at all, or at least very rarely, and it still irritates me.
You are not alone. When I see sum([a, b, c]),
Steven D'Aprano wrote:
I've long believed that + is the wrong operator for concatenating
strings, and that & makes a much better operator.
Do you have a reason for preferring '&' in particular, or
do you just want something different from '+'?
Personally I can't see why "bitwise and" on string
On Fri, Aug 08, 2014 at 10:20:37PM -0400, Alexander Belopolsky wrote:
> On Fri, Aug 8, 2014 at 8:56 PM, Ethan Furman wrote:
>
> > I don't use sum at all, or at least very rarely, and it still irritates me.
>
>
> You are not alone. When I see sum([a, b, c]), I think it is a + b + c, but
> in Py
On Fri, Aug 8, 2014 at 8:56 PM, Ethan Furman wrote:
> I don't use sum at all, or at least very rarely, and it still irritates me.
You are not alone. When I see sum([a, b, c]), I think it is a + b + c, but
in Python it is 0 + a + b + c. If we had a "join" operator for strings
that is different
On 08/08/2014 05:34 PM, Raymond Hettinger wrote:
On Aug 8, 2014, at 11:09 AM, Ethan Furman mailto:et...@stoneleaf.us>> wrote:
So why not apply a similar optimization to sum() for strings?
That I cannot answer -- I find the current situation with sum highly irritating.
It is only irritatin
On Aug 8, 2014, at 11:09 AM, Ethan Furman wrote:
>> So why not apply a similar optimization to sum() for strings?
>
> That I cannot answer -- I find the current situation with sum highly
> irritating.
>
It is only irritating if you are misusing sum().
The str.__add__ optimization was put in
On 08/08/2014 08:23 AM, Chris Barker wrote:
So my final question is this:
repeated string concatenation is not the "recommended" way to do this -- but
nevertheless, cPython has an optimization
that makes it fast and efficient, to the point that there is no practical
performance reason to pref
On Thu, Aug 7, 2014 at 4:01 PM, Ethan Furman wrote:
> I don't remember where, but I believe that cPython has an optimization
> built in for repeated string concatenation, which is probably why you
> aren't seeing big differences between the + and the sum().
>
Indeed -- clearly so.
A little test
ACTIVITY SUMMARY (2014-08-01 - 2014-08-08)
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On Fri, Aug 8, 2014 at 8:27 AM, Paul Moore wrote:
> I had a use case where I wanted to allow a config file to contain
> "path: foo" to create a file called foo, and "path: foo/" to create a
> directory. It was a shortcut for specifying an explicit "directory:
> true" parameter as well.
>
Here is
On 7 August 2014 02:55, Antoine Pitrou wrote:
> pathlib is generally concerned with filesystem operations written in Python,
> not arbitrary third-party tools. Also it is probably easy to append the
> trailing slash in your command-line invocation, if so desired.
I had a use case where I wanted t
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