inconsistency with += between different types ?

[Andreas Leitgeb]

Mark McEahern <marklists at mceahern.com> wrote:
>> It seems that  lists are the only type, where the changes get visible
>> outside, although I'd have expected all types to behave as lists do.
> 
> lists are mutable.  strings and ints aren't.

and someone else wrote:
" even mutable objects may define their __iadd__ to do an assignment.

That makes of course sense ...

thanks to all who answered. 

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