catalogue
- 1、 Same point
- 2、 Distinction
- 1. Load and loads (deserialization)
- 2. Dump and dumps (serialization)
- 3、 JSON advanced
- 1. Serialization
- 2. Deserialization
- 4、 Serialization and deserialization in Python
- 1. Access memory objects to disk
- 2. Read memory object from disk
1、 Same point
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dumpanddumpsBoth implement serialization -
loadandloadsBoth implement deserialization
The process of changing a variable from memory to storable or transmissible is called serialization. Serialization is the process of transforming the object state into a storable or transmissible format.
The re reading of variable contents from serialized objects to memory is called deserialization. Deserialization is the conversion of streams into objects.
2、 Distinction
1. Load and loads (deserialization)
load：For file handles, thejsonConvert characters in format todict, read from filestringConvert todict)
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a_json = json.load(open('demo.json','r')) |
loads：For memory objects, thestringConvert todict (convert string to dict)
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a = json.loads('{'a':'1111','b':'2222'}') |
2. Dump and dumps (serialization)
dump：Convert dict type tojsonString format, written to file (easy to store)
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a_dict = {'a':'1111','b':'2222'}json.dump(a_dict, open('demo.json', 'w') |
dumps：Convert dict tostring (easy transmission)
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a_dict = {'a':'1111','b':'2222'}a_str = json.dumps(a_dict) |
Summary:
According to the characteristics of serialization and deserialization
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loads：Will be
stringConvert todict -
dumps：Will be
dictConvert tostring -
load：It’s Jiang Li
jsonFormat string converted todict, read file -
dump：Will be
dictType conversion tojsonFormat string, stored in file
3、 JSON advanced
1. Serialization
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#Using class objects__ dict__ methodclass Student(object): def __init__(self, name, age, score): self.name = name self.age = age self.score = scoreimport jsons = Student('Bob', 20, 88)print(json.dumps(s, default=lambda obj: obj.__dict__)) |
2. Deserialization
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#Python learning exchange group: 531509025def dict2student(d): return Student(d['name'], d['age'], d['score'])json_str = '{"age": 20, "score": 88, "name": "Bob"}'print(json.loads(json_str, object_hook=dict2student)) |
4、 Serialization and deserialization in Python
PythonTwo modules are provided for serialization:cPickleandpickle。 The functions of the two modules are the same, but the difference iscPickleIt’s written in C language. It’s fast,pickleIs purePythonIt’s written slowly.
- The process by which a variable becomes storable or transmissible from memory is called serialization
PythonMiddle callpickling - The re reading of variable contents from serialized objects to memory is called deserialization, i.e
unpickling
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try: import cPickle as pickleexcept ImportError: import pickle |
1. Access memory objects to disk
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a = dict(a=1, b=2, c=3)pickle.dumps(a) #Serialize the object into STR and store it in a filea = dict(a=1, b=2, c=3)pickle.dump(a, open('a.txt', 'wb')) #Use dump to directly serialize the object into file like object. Note that it is binary storage |
2. Read memory object from disk
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pickle.load(open('a.txt', 'rb')) #Deserialize the object directly from file like object |
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