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Sorry, CPython is much easier to hack on than PyPy. To start with, for every change you do recompilation takes 4GB of memory and half an hour to complete.

This is a rather slow feedback cycle.

Secondly, while the syntax of RPython may be clean the necessary incantations to actually achieve something aren't at all obvious.

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Lots of RPython development can be done in the repl, code can be debugged with pdb. Not nearly as difficult as it is often made out to be.

I don't know much about pypy, but do you need to compile it each time? Just use pypy to live interpret the interpreter.

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