Stef Mientki wrote:
> Evan Klitzke wrote:
>> On 6/19/07, Stef Mientki <[EMAIL PROTECTED]> wrote:
>>> hello,
>>>
>>> I need to search a piece of text and make all words that are equal
>>> (except their case) also equal in their case, based on the first
>>> occurrence.
>>> So I'm using a dictionary to store names and attributes of objects.
>>> As as I need to search on the caseless name (so I've choosen lowercase),
>>> My dictionairy looks like this:
>>>
>>> self.procs [ "serial_hw_read" ] = ( "Serial_HW_Read", "F",
>>> "++", T)
>>>
>>> Is this really a good solution,
>>> or are there better ways ?
>>
>> Since you want an almost dictionary, you should create a new class
>> that inherits from dict and overloads the methods that you want to
>> change.
>
> Suppose I succeed in creating my own type, derived from dictionary,
> I would be able to add/set a key like this:
>
> self.procs [ "Serial_HW_Read" ] = ( "F", "++", T)
>
> and now I can query the dictionary by
>
> self.procs.has_key ( "serial_hw_read")
>
> but how do I get the original string "Serial_HW_Read" back ?
I probably wouldn't inherit from dict -- you're going to need to
redefine most of the methods anyway. I'd do something like::
>>> class D(object):
... def __init__(self):
... self._dict = {}
... self._original_keys = {}
... def __iter__(self):
... for key in self._dict:
... yield self._original_keys[key]
... def __contains__(self, key):
... return key.lower() in self._dict
... def __getitem__(self, key):
... return self._dict[key.lower()]
... def __setitem__(self, key, value):
... self._dict[key.lower()] = value
... if key not in self._original_keys:
... self._original_keys[key.lower()] = key
...
>>> procs = D()
>>> procs['Serial_HW_Read'] = 'F', '++', 'T'
>>> 'serial_hw_read' in procs
True
>>> procs['SErial_Hw_reAD']
('F', '++', 'T')
>>> list(procs)
['Serial_HW_Read']
Note that because I store the first form encountered for every key, I
can always use the lower-case version to retrieve the "original string".
STeVe
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