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> functools.partial is a somewhat less than ideal comparison. The pure-Python version is not picklable, the Python and C versions return different things (the Python version is a function returning a function, the C version is a regular class and returns an instance).
Looks as Python version of functools.partial() needs a fix.
Reimplementations of the pure-Python itemgetter and attrgetter to automatically pickleable Python classes have a disadvantage. It makes the pickling incompatible between Python and C versions. This means that itemgetter pickled in CPython will be not unpickleable on Python implementation which don't use C accelerator and vice versa.