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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