python's memory-saving dictionary data structure

Overview

ConstDict

python代替的Dict数据结构

若字典不会增加字段,只读/原字段修改
使用ConstDict可节省内存

Dict()内存主要消耗的地方:

1、Dict扩容机制,预留内存空间
2、Dict也是一个对象,内部会动态维护__dict__,增加slot类属性可以节省内容

节省内存大小:一半左右,字段越大节省越多
适用场景:需要生成大量的静态字典场景
缺点:根据字典的属性,生成类对象,再生产对象

python版本:python2.7

例子:

>> >>> class MonsterDict(constdict.ConstDict): ... __slots__ = test_dic.keys() >>> const_dic = MonsterDict(test_dic) >>> print(asizesof(test_dic)) (1192,) >>> print(asizesof(const_dic)) (584,) >>> print(const_dic) {'m_Defense': 4, 'm_Speed': 5, 'm_Hit': 7, 'm_Double': 8, 'm_Attack': 3, 'm_HP': 1, 'm_Dodge': 6, 'm_MP': 2} >>> print(const_dic.keys()) ['m_HP', 'm_Defense', 'm_Speed', 'm_Attack', 'm_Dodge', 'm_MP', 'm_Hit', 'm_Double'] >>> print(const_dic.values()) [1, 4, 5, 3, 6, 2, 7, 8] >>> const_dic["m_Dodge"] = 12456 >>> print(const_dic["m_Dodge"]) 12456 >>> print(const_dic.iteritems()) at 0x00000000094FA2C8> ">
>>> test_dic = {
...     "m_HP": 1,
...     "m_MP": 2,
...     "m_Attack": 3,
...     "m_Defense": 4,
...     "m_Speed": 5,
...     "m_Dodge": 6,
...     "m_Hit": 7,
...     "m_Double": 8,
... }
>>>
>>> class MonsterDict(constdict.ConstDict):
...     __slots__ = test_dic.keys()
    

>>> const_dic = MonsterDict(test_dic)
>>> print(asizesof(test_dic))
(1192,)
>>> print(asizesof(const_dic))
(584,)


>>> print(const_dic)
{'m_Defense': 4, 'm_Speed': 5, 'm_Hit': 7, 'm_Double': 8, 'm_Attack': 3, 'm_HP': 1, 'm_Dodge': 6, 'm_MP': 2}


>>> print(const_dic.keys())
['m_HP', 'm_Defense', 'm_Speed', 'm_Attack', 'm_Dodge', 'm_MP', 'm_Hit', 'm_Double']


>>> print(const_dic.values())
[1, 4, 5, 3, 6, 2, 7, 8]


>>> const_dic["m_Dodge"] = 12456
>>> print(const_dic["m_Dodge"])
12456


>>> print(const_dic.iteritems())

    
      at 0x00000000094FA2C8>

    
Owner
Grenter
Hi,i am Grenter
Grenter
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