functools.partial workalike where provided positionals are appended, not prepended.

partial_last.py

import functools

class partial_last(functools.partial):
    """Like functools.partial, but fill positionals from the end.
    
    Useful for builtin C functions where you *can't* pass later args as
    keywords because CPython is stupid about that.
    
    Examples
    --------
    >>> int_checker = partial_last(isinstance, int)
    >>> int_checker(5)
    True
    >>> int_checker('Bob')
    False
    >>> foo_attr_getter = partial_last(getattr, 'foo', 'no way jose')
    >>> class Bar(object):
    ...     foo = 'yes sirree'
    >>> foo_attr_getter(Bar())
    'yes sirree'
    >>> foo_attr_getter(6)
    'no way jose'
    
    """
    def __call__(self, *args, **kwargs):
        all_kw = dict(self.keywords) if self.keywords is not None else {}
        all_kw.update(kwargs)
        return self.func(*(args + self.args), **all_kw)