unicode woes

[Ulli Stein]

Matt Gerrans wrote:

>> - Never mix byte strings and Unicode strings (unless the byte strings
>>   are restricted to bytes <127, perhaps).
> 
> Could you elaborate a bit more on this point?   I thought this was okay to
> do, since the byte string will be promoted to unicode.   For instance:
> 
>>>> 'abcd' + u'zyxw'
> u'abcdzyxw'
> 
> Is this an acceptible thing to do?

It would be very nice. But since the coercion would take the default 
encoding this is not acceptible.

Ulli