def initargs(self):
return {"<STR_LIT>": self.params, "<STR_LIT>": self.values, "<STR_LIT>": self.ordered}<EOL>
Pickling helper method which returns a dictionary of function
parameters which get passed to pickle via `__getinitargs__
<https://docs.python.org/2/library/pickle.html#object.__getinitargs__>`_

Returns
-------
arg_dict : dictionary
    ``**kwargs`` to be passed to the __init__ func after unpickling