[PyKDE] QString and + operator

Phil Thompson phil at riverbankcomputing.co.uk
Thu Apr 14 13:29:56 BST 2005

> Phil Thompson <phil at riverbankcomputing.co.uk> wrote:
>>> I'm making a requirement for a project I'm working on to work with
> QString
>>> instead of the built-in type as much as possible. Some will obviously
>>> complain about this, needing to cast to str() to keep some pythonic
> spirit
>>> for concatenation, augmented assignment, etc. I remember seeing in this
>>> message
>>> (http://mats.imk.fraunhofer.de/pipermail/pykde/2002-November/003954.html)
>>> that Phil mentioned supporting the '+' operator for mixed types. I
> imagine
>>> the problem is determining what to return. Is there still an interest
>>> in
>>> exposing this?
>> I thought I had implemented it - must have slipped through the cracks.
>> It
>> will be in the next snapshot.
>> Note that...
>> q = QString("foo") + QString("bar")
> This one is OK with me (it's a faitful binding of the existing C++
> operator)
> but:
>> q = QString("foo") + "bar"
>> ...will both work, but...
>> s = "foo" + QString("bar")
>> ...will not.
> Is there a need for QString+str in the first place? If not, I'd rather not
> have it: explicit is better than implicit :)
> Also, having it working one way but not the other is confusing. So better
> prohibit mixed types altogether IMO.

I'm inclined to agree. It works because Python strings are automatically
converted to QStrings when needed - although it is trivial to suppress
this in this case.



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