Performance maybe, but not without gotchas. However, compatibility is certainly not: http://packages.pypy.org/ http://packages.pypy.org/ Scipy/scikit-learn/p

Performance maybe, but not without gotchas. However, compatibility is certainly not: http://packages.pypy.org/ http://packages.pypy.org/ Scipy/scikit-learn/pandas/matplotlib/h5py aren't supported, and all the packages depends on them, which makes it not an option for probably the most important segment of python's user base.