---------- Forwarded message ---------- From: Akathorn Greyhat <[EMAIL PROTECTED]> Date: 2008/7/14 Subject: Re: Dictionary bidirectional To: Kless <[EMAIL PROTECTED]>
2008/7/14 Kless <[EMAIL PROTECTED]>: I need a dictionary where get the result from a 'key' (on left), but > also from a 'value' (on right), how to get it? > > I know that dictionaries aren't bidirectional, but is there any way > without use two dictionaries? > > > Thanks in advance! > -- > http://mail.python.org/mailman/listinfo/python-list > You could make your own class for that, maybe something like ######### class MyCoolDictionary(dict): def __init__(self, *args, **kargs): dict.__init__(self, *args, **kargs) def __getitem__(self, item): try: return dict.__getitem__(self, item) except KeyError: keys=[] for i in dictio.keys(): if dictio[i]==item: keys.append(i) return keys dictio=MyCoolDictionary({"a" : 1, "b" : 2, "c" : 2}) print dictio["a"] print dictio["b"] print dictio[1] print dictio[2] ######### The output of this code is: 1 2 ['a'] ['c', 'b'] Note that it isn't finish, maybe you'll need to make some kind of test before adding a new value because with this code one value can have multiple keys, and I have fixed it by returning a list of keys instead a single value. It's up to you =) I'm sorry of my poor english =( Regards, Akathorn Greyhat
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