strange behaviour of sum()
Inyeol Lee
inyeol.lee at siimage.com
Wed Nov 19 20:17:49 EST 2003
On Wed, Nov 19, 2003 at 11:46:07PM +0100, Jan-Erik Meyer-Lütgens wrote:
[...]
> I'd ran into trouble when I've used sum() naively:
[...]
> The other strange behaviour is:
>
> sum(['my', 'pet', 'fish', 'eric'], '')
>
> results in:
>
> TypeError: sum() can't sum strings [use ''.join(seq) instead]
>
> If there is a special treatment for strings, why doesn't sum()
> use ''.join(seq) itself, instead of telling me that I should
> use it? But in fact sum() should call operator.add(), even
> for strings:
There was a duscussion on this in python-dev. See thread starting from
http://mail.python.org/pipermail/python-dev/2003-April/034767.html
and Guido's summary at
http://mail.python.org/pipermail/python-dev/2003-April/034853.html
.
-Inyeol Lee
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