python字典支持双向索引吗

字典模块提供三个类来处理一对一映射类型的一些操作

'bidict', 'inverted', 'namedbidict'

>>> import bidict
>>> dir(bidict)
['MutableMapping', '_LEGALNAMEPAT', '_LEGALNAMERE', '__builtins__', '__doc__', 
'__file__', '__name__', '__package__', 'bidict', 'inverted', 'namedbidict', 're', 'wraps']

1.bidict类：

>>> from bidict import bidict
>>> D=bidict({'a':'b'})
>>> D['a']
'b'
>>> D[:'b']
'a'
>>> ~D        #反转字典
bidict({'b': 'a'})
>>> dict(D)    #转为普通字典
{'a': 'b'}
>>> D['c']='c'   #添加元素，普通字典的方法都可以用
>>> D
bidict({'a': 'b', 'c': 'c'})

2.inverted类，反转字典的键值

>>> seq = [(1, 'one'), (2, 'two'), (3, 'three')]
>>> list(inverted(seq))
    [('one', 1), ('two', 2), ('three', 3)]

3.namedbidict(mapname, fwdname, invname)：

>>> CoupleMap = namedbidict('CoupleMap', 'husbands', 'wives')
>>> famous = CoupleMap({'bill': 'hillary'})
>>> famous.husbands['bill']
'hillary'
>>> famous.wives['hillary']
'bill'
>>> famous.husbands['barack'] = 'michelle'
>>> del famous.wives['hillary']
>>> famous
CoupleMap({'barack': 'michelle'})

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