What encoding does u'...' syntax use?

["Martin v. Löwis"]

>> I'm pretty much sure it is UCS-2 or UCS-4. (Yes, I know there is only a
>> slight difference to UTF-16/UTF-32).
> 
> I wouldn't call the difference that slight, especially between UTF-16
> and UCS-2, since the former can encode all Unicode code points, while
> the latter can only encode those in the BMP.

Indeed. As Python *can* encode all characters even in 2-byte mode
(since PEP 261), it seems clear that Python's Unicode representation
is *not* strictly UCS-2 anymore.

Regards,
Martin