[Python-3000] Immutable bytes type and dbm modules

[Georg Brandl]

Greg Ewing schrieb:

> So concatenating mutable and immutable should give the
> same result as concatenating two immutables, i.e. an
> immutable. If you need to add something to the end of
> your buffer, while keeping it mutable, you use extend().
> 
> This gives us
> 
>    immutable + immutable -> immutable
>    mutable + immutable -> immutable
>    immutable + mutable -> immutable
>    mutable + mutable -> mutable  (*)

NB: when dealing with sets and frozensets, you get the type of
the first operand.  Doing something different here is confusing.

Georg


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