[IronPython] [Python-Dev] Exception for setting attributes of built-in type

[Michael Foord]

Dino Viehland wrote:
> Guido wrote:
>   
>> I should add that this policy is also forced somewhat by the existence
>> of the "multiple interpreters in one address space" feature, which is
>> used e.g. by mod_python. This feature attempts to provide isolation
>> between interpreters to the point that each one can have a completely
>> different set of modules loaded and can be working on a totally
>> different application. The implementation of CPython shares built-in
>> types between multiple interpreters (and it wouldn't be easy to change
>> this); if you were able to modify a built-in type from one
>> interpreter, all other interpreters would see that same modification.
>>     
>
> IronPython is in the exact same boat here - we share built-in types
> Across multiple Python engines as well.
>
>
>   

And indeed it is needed - if you are working with multiple interpreters 
(engines in IronPython) you don't want isinstance(something, dict) to 
fail because it is a dictionary from a different interpreter...

Michael

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