README中文文档 | JSON Specs | MsgPack Specs | Python Docs: Pickle
This is a library to serialize+compress and deserialize+decompress data. It is very easy to utilize, and can be used under various environments.
By using this library, the user/developer can easily serialize+compress data in Python, like dict, list etc, save the end result as blob to databases, save them to redis or memcached servers, or exchange them between python processes. It can save quite some space.
To install, please run pip install SeCo; and the Seco class can be used by adding the from seco import SeCo import line and the seco = SeCo() instantiate line to your program.
The best combination is msgpack and zlib for it is fast and space conservative. The default is json and zlib because in most cases it is sufficient.
The default json serializer relies on simplejson instead of core json because under Python 3.5 the core JSON package cannot use bytes as input for loading.
However, each combination has its strengths and weaknesses, choose according to your needs.
For example, json cannot serialize bytes or bytearray objects; both json and msgpack cannot serialize set, frozenset instances. For the broadest possible serialization support, the user can use pickle as the serializer as it can serialize almost all Python objects. But remember that pickle is not compatible with other languages, and its result bloats quite a bit, so if you are limited by space, use the other two serializers.
Another example, zlib is faster, or much faster, than bz2, but the compressed result is not as space efficient as that of bz2's, and the gzip is in-between of zlib and bz2 in terms of speed and compression ratio. There is also lzma compression library available to Python 3 environment, it is quite slow and it is not available under Python 2, but it has a a quite impressive compression ratio. You can absolutely change the compressor to lzma if you want.
After installing using pip install SeCo, one can simply from seco import SeCo. SeCo is the only class provided in this module, its instance is responsible for serializing + compressing and de-serializing + decompressing functionality. It provides loads, dumps, load, dump methods to conform Python conventions, and it also provides __call__ magic method for quick operations.
Signature: SeCo(serialize = None, compress = None)
To construct an instance, simply provide the constructor with two optional, desired parameters.
- serialize = None: the first parameter, can be anything in (None, 'json', 'msgpack', 'pickle').
- compress = None: the second parameter, can be anything in (None, 'zlib', 'gzip', 'bz2', 'lzma').
from seco import SeCo
import json, lzma
# use defaults serializer and compressor
seco = SeCo() # `json` and `zlib`
# use different serializer or compressor
seco = SeCo('msgpack', 'bz2')
seco = SeCo('pickle', 'zlib')
# serialize and compress data payload
# uses __call__ method, the second parameter is the `switch`
seco({'test': 'case'}) # `bytes` object returned
seco({'test': 'case'}, True) # `bytes` object returned, the same
seco(seco({'test': 'case'}), False) # decompress, {'test': 'case'}
# Python conventions
seco.dumps(100) # `bytes` object
seco.loads(seco.dumps(100)) # 100 returned
seco.dump([1,2,3,4,5], open('test', 'wb'))
seco.load(open('test', 'rb')) # [1,2,3,4,5]
# access and change the serializer and compressor
ser = seco.serializer # access the serializer
seco.serializer = json # change to json
com = seco.compressor # access the compressor
seco.compressor = lzma # change to lzmaThis project is licensed under two permissive licenses, please chose one or both of the licenses to your like. Although not necessary, bug reports or feature improvements, attributes to the author(s), information on how this program is used are welcome and appreciated :-) Happy coding
[BSD-2-Clause License]
Copyright 2018 Hansheng Zhao
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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[MIT License]
Copyright 2018 Hansheng Zhao
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