why are some types immutable?

[Peter Maas]

Torsten Mohr schrieb:
> reading the documentation (and also from a hint from this NG)
> i know now that there are some types that are not mutable.
> 
> But why is it this way?

Immutable types (e.g. strings, tuples) allow for code optimization
in some situations and can be used as dictionary keys. For the latter
reason see:

http://www.python.org/moin/DictionaryKeys

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