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add reference for dict in python using formatted string

Project description

refdict

在Python使用refdict更好地组织与访问数据

兼容dict/list/tuple/str!

Install

pip install refdict

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

[]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separator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

  • 能够像使用dict/list/tuple/str一样使用refdict
    • 能够调用对应类型的函数,如refdict({}).keys()refdict([]).append(123)
    • 迭代与成员判断for x in refdict([1, 2, 3])
    • 切片与切片赋值refdict([1, 2, 3])[:] => [1, 2, 3]
    • ...
  • 能够通过一个字符串链式访问内部成员
    • refdict({'1':{'1':{'1':{'1':'1'}}}})['1.1.1.1'] => 1
  • 能够通过引用字符串实现对象与对象之间的互相引用

Warnings

使用形如item: @item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!
}

FAQ

  • Q - 为什么我用1作为下标访问不到list/tuple/str的第一个元素?
    • A - 和python一样,下标从0开始计数。虽然用起来有时候感觉有些反直觉,但是是合理的
  • Q - 为什么我不能像refdict[1][2][3]这样使用引用的特性?
    • A - 引用解析仅限于第一个[],第一个[]会返回一个正常的tuple/list/dict/str而不是一个refdict对象,所以后面的操作无法使用引用特性

Change Log

v2.1.0

  • 可以调用根数据类型的非内置函数
    • 比如refdict({})可以使用dictkeys函数,refdict([])可以使用listappend函数
  • []运算的参数keys添加int类型和slice类型的支持,以便更好地访问list/tuple/str。目前参数keys仅支持strintslice三种类型
  • 实现__contains__
  • 实现__str__以便输出
  • 实现__delitem__以使用引用解析来删除元素

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

  • 实现基本的[]取值与赋值
  • 实现text函数以获得字面值

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