attr_to_arg.py

def attr_to_arg(func):
    """
    This is stupid and I love it.

    Basically instead of calling:

        foo("thing", stuff)

    You can call:

        foo.thing(stuff)
        
    once you apply this decorator to foo.
    
    Works on methods, unless you try using the 'unbound' method.
    """

    class AttrGetter:
        def __init__(self):
            self.instance = None

        def __getattr__(self, item):
            return Caller(self.instance, item)

        def __get__(self, instance, owner):
            self.instance = instance
            return self

    class Caller:
        def __init__(self, instance, item):
            self.instance = instance
            self.item = item

        def __call__(self, *args, **kwargs):
            if self.instance is None:
                return func(self.item, *args, **kwargs)
            else:
                return func(self.instance, self.item, *args, **kwargs)

    return AttrGetter()