I see the value in this. It calls _fixup after concatenating. Can you 
submit a PR?

On Wednesday, 5 October 2016 14:51:59 UTC-5, Joe Barnhart wrote:
>
> One Python helper I find enormously useful is "extend()" as applied to 
> list objects.  Extend differs from append in that it adds the items of the 
> list provided at the same level as the current list items, thereby 
> "extending" the list. 
>
> An example:
>
> body = DIV("this","is","the","body")
>
> Result: a DIV with four elements in it.
>
> body.append(["and","additional","elements"])
>
> Result:  Not what you wanted!  It appends a list to the original DIV 
> making a mess.
>
> body.extend(["and","additional","elements"])
>
> This is what you wanted:
>
> DIV("this","is","the","body","and","additional","elements")
>
> I've been monkey-patching "extend" into DIV quite awhile now and thought 
> you may want to consider adding it to the DIV helper.  Here is my 
> monkey-patch:
>
> def extend(self,coll):
>     self._setnode(coll)
>     ret = self.components.extend(coll)
>     self._fixup()
>     return ret
> DIV.extend = extend
>
>

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