Actually, PyPy is already a drop-in replacement for many uses, and is getting closer to being a complete drop-in replacement all the time. For example, they ha

Actually, PyPy is already a drop-in replacement for many uses, and is getting closer to being a complete drop-in replacement all the time. For example, they have a source-compatible implementation of the CPython C API: http://morepypy.blogspot.com/2010/04/using-cpython-extension-modules-with.html http://morepypy.blogspot.com/2010/04/using-cpython-extension...