PyPy, an alternative implementation of Python, has been gaining attention and interest over the last few years, in no small part because of its high speed. PyPy has, at its core, a small language called RPython (“restricted Python”) in which PyPy is implemented. In theory, you can use RPython to implement other languages. In this talk, Julian Berman demonstrates how to build a small language using RPython. If you’re interested in PyPy or in how programming languages work, this talk should be of interest to you.
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