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import json

new_dict = {'s_uid': 1,
        's_date': ['2017-05-01', '2017-05-15'],
        's_T': 2,
        's_time': ['12:00:00', '17:00:00'],
        's_local': 2,
        'percent': 0.53,
        'loss': 0.3,
        'a': 4}

print(new_dict)
print(type(new_dict))


json_str = json.dumps(new_dict)
print(json_str)
print(type(json_str))

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{'a': 4, 'loss': 0.3, 's_date': ['2017-05-01', '2017-05-15'], 's_uid': 1, 's_time': ['12:00:00', '17:00:00'], 's_local': 2, 'percent': 0.53, 's_T': 2}
<type 'dict'>
{"a": 4, "loss": 0.3, "s_date": ["2017-05-01", "2017-05-15"], "s_uid": 1, "s_time": ["12:00:00", "17:00:00"], "s_local": 2, "percent": 0.53, "s_T": 2}
<type 'str'>

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with open("mode.json","w") as f:
	json.dump(dict,f)

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new_dict = json.loads(json_str)
print(new_dict)
print(type(new_dict))

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{u'a': 4, u'loss': 0.3, u's_T': 2, u'percent': 0.53, u's_date': [u'2017-05-01', u'2017-05-15'], u's_uid': 1, u's_time': [u'12:00:00', u'17:00:00'], u's_local': 2}
<type 'dict'>

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with open("mode.json",'r') as load_f:
    load_dict = json.load(load_f)
    print(load_dict)