pickle

#pythonのデータをそのまま保存できます。

import pickle


class T(object):
    def __init__(self, name):
        self.name = name

data={
    'a': [1, 2, 3],
    'b': ('test', 'test'),
    'c': {'key': 'value'},
    'd': T('test')
}

#バイナリで書き込み
with open('data.pickle', 'wb') as f:
    pickle.dump(data, f)

with open('data.pickle','rb') as f:
    data_loaded = pickle.load(f)
    print(data_loaded)

出力：

{'a': [1, 2, 3], 'b': ('test', 'test'), 'c': {'key': 'value'}, 'd': <__main__.T object at 0x1145d0c50>}