DeepPartial.py

from itertools import chain

class DeepPartial(object):

    def __init__(self, func, *args, **kwargs):
        self.func = func
        self.args = args
        self.kwargs = kwargs

    def _call(self, callee):
        if isinstance(callee, self.__class__):
            return callee()
        else:
            return callee

    def _call_dpartials(self, args, kwargs):
        called = [self._call(a) for a in args]
        called_kw = {n: self._call(v) for n, v in kwargs.items()}
        return called, called_kw

    def _call_children(self):
        return self._call_dpartials(self.args, self.kwargs)

    def __call__(self, *iargs, **ikwargs):
        args, kwargs = self._call_children()
        kwargs.update(ikwargs)
        return self.func(*chain(args, iargs), **kwargs)