Feature Proposal: Sequence .join method

[Steven Bethard]

David Murmann wrote:
> Hi all!
> 
> I could not find out whether this has been proposed before (there are 
> too many discussion on join as a sequence method with different 
> semantics). So, i propose a generalized .join method on all sequences 
> with these semantics:
> 
> def join(self, seq):
>     T = type(self)
>     result = T()
>     if len(seq):
>         result = T(seq[0])
>         for item in seq[1:]:
>             result = result + self + T(item)
>     return result
> 
> This would allow code like the following:
> 
> [0].join([[5], [42, 5], [1, 2, 3], [23]])

I don't like the idea of having to put this on all sequences.  If you 
want this, I'd instead propose it as a function (perhaps builtin, 
perhaps in some other module).

Also, this particular implementation is a bad idea.  The repeated += to 
result is likely to result in O(N**2) behavior.

STeVe