edsac instructions

class Instruction(object):
    def __init__(**kwargs):
        for k,v in kwargs.items():
            self.k = v

    def __repr__(self):
        return "%s %r" % (self.__class__, self.__dict__)

    def __call__(self,memory):
        # do whatever it is that this thing does, returning (a copy of) the memory
        return memory
       

class Store(Instruction):
    def __init__(self,....):
        # if you want to get fancy here with params, do so

    def __call__(self,memory):
       # do whatever store does
       set_word(memory,self.position, self.value) # or whatever!
       return memory