Brett Cannon added the comment:

Alex: yes, the builtins could almost all be re-implemented in pure Python, but 
there is a performance consideration vs. benefit (e.g. if we re-implemented 
map() in Python which VMs would use it vs. implement it in some native way for 
performance?).

But one place I think there could be a benefit w/o performance issues is the 
built-in exceptions as you should be able to store references to the classes to 
help minimize the added cost of startup creating the exceptions from Python 
code.

Amaury: other VMs and easier extensibility in the future. We might as well all 
share the burden of maintaining pure Python versions instead of re-implementing 
the same thing over and over in little VM silos. And if some new thing needs to 
be added for a module it's easier to do it in Python than C (which then also 
continues to benefit other VMs).

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<http://bugs.python.org/issue16651>
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