add reference for dict in python using formatted string
Project description
refdict
在Python使用refdict更好地组织数据
使用data['key.key.key.1.2.3']
实现data['key']['key']['key'][1][2][3]的效果
兼容dict/list/tuple/string!
Usage
在字符串值前面加上引用前缀使其变成另一个对象的引用。默认的引用前缀是@。可以在构造函数中传入参数refPrefix来改变引用前缀
在[]运算符中使用一个字符串实现refdict内容的链式访问。使用.作为多个key的连接符。可以在构造函数传入参数divider来改变分隔符
data = {
'player': {
'name': 'DiscreteTom',
'items': [
'@apple',
'@potion.red'
],
'weapon': '@sword',
'attack': '@player.weapon.attack',
'me': '@player'
},
'apple': 'restore your health by 10%',
'potion': {
'red': 'restore your health by 20%',
},
'sword': {
'attack': 123,
'value': 50
},
}
rd = refdict(data)
print(rd['player.items.1']) # => restore your health by 20%
print(rd['player.attack']) # => 123
rd['player.items.1'] = 'empty'
print(rd['player.items.1']) # => empty
print(rd['player.items.:.1']) # => empty
rd['player.items.:'] = []
print(rd['player.items']) # => []
print(rd.text('player.me.attack')) # => @player.weapon.attack
Features
- 能够解析
dict/list/tuple/str和其他支持[]运算符的数据类型- 如果使用默认的分隔符
.,那么dict的key中不能出现. list/tuple/str之外的类型在解析key的时候作为str解析
- 如果使用默认的分隔符
- 可以在value中使用
.连接属性- 如
rd['player.items.1'] = '@potion.red' = 'restore your health by 20%'
- 如
- 链式解析
- 因为
rd['player.weapon'] = '@sword',所以rd['player.attack'] = '@player.weapon.attack' = '@sword.attack' = 123
- 因为
- 赋值操作。如果被赋值的对象是引用字符串,则仅解引用,不删除引用目标
- 如
rd['player.items.1'] = 'empty'解除了原本其指向apple的引用并赋值为empty,但是并没有删除apple
- 如
- 切片取值与赋值。对于
list/tuple/str可以使用[:]进行切片- 如
rd['player.items.:.1'] = ['@apple', 'empty'][:][1] = ['@apple', 'empty'][1] = 'empty'
- 如
- 使用
text函数取字面值。text函数正常计算前n-1个key,然后直接返回最后一个key对应的字面值- 如
rd.text('player.me.attack')计算rd['player.me']得到player对象,attack作为最后一个key直接返回字面值@player.weapon.attack
- 如
Warnings
使用形如item: @item的递归引用会导致死循环,包括间接递归引用
data = {
'item': '@item', # => infinite loop!
'wrapper': {
'item': '@wrapper.item' # => infinite loop!
},
'a': '@b' # => infinite loop!
'b': '@a' # => infinite loop!
}
Change Log
v2.0.0
改名。还是小写看起来舒服。但是不向前兼容了所以就用2.0.0的版本号好了
v1.0.0
- 实现
[]取值与赋值 - 实现
text函数以获得字面值
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