singleton.py

class SingletonIndex(object):
    singleton = None

    def __new__(cls, *args, **kwargs):
        if not cls.singleton:
            cls.singleton = object.__new__(SingletonIndex)
        return cls.singleton

    def __init__(self, path):
        self.index = similarities.Similarity.load(path)

    def get(self):
        return self.index


class SingletonDictionary(object):
    singleton = None

    def __new__(cls, *args, **kwargs):
        if not cls.singleton:
            cls.singleton = object.__new__(SingletonDictionary)
        return cls.singleton

    def __init__(self, path):
        self.dictionary = corpora.Dictionary.load(path)

    def get(self):
        return self.dictionary