case insensitive list ?

Stef Mientki stef.mientki at gmail.com
Tue Apr 6 14:21:19 CEST 2010


On 05-04-2010 19:23, Robert Kern wrote:
> On 2010-04-05 12:17 PM, Stef Mientki wrote:
>> hello,
>>
>> AFAIK there's no case insensitive list in Python.
>> By case insentive I mean that that sort and memebr of is case
>> insensitive.
>>
>> Does soeone has a implementation of sucha case insensitive list ?
>
> mylist.sort(key=lambda x: x.lower())
> any(x.lower() == lowercase_query for x in mylist)
>

thanks Robert,
your code works perfectly,
but I was thinking of something more easy to repeat and mor eidentical
to existing lists.
Or in other words, I want to use exactly the same commands and operators
as with normal lists,
like this
    _List = NoCase_List ( 'coala', 'donky' )
    My_List.append ( 'Aap' )
    My_List.append ( 'aapje' )
    My_List.append ( 'beerthe' )
    My_List.append ( 'BEER' )
    print My_List
    My_List.sort ()
    print My_List
    My_List.append ( 'aapJ' )
    print My_List
    print My_List.index ( 'beer' )
    print 'beer' in My_List
    print 'beert' in My_List

After some trial and error the code below, gives almost the desired results.

The only problem I see for now,
is that replacing the items-list in wxpython widgets don't work,
so I'l  ask my question to the wxPython list.

cheers,
Stef



class NoCase_List ( list ) :
  """
  Case Insensitive List :
  The methods "sort" and "index" are case insensitive.
  The "in" operator works also case insensitive.
  After the list is sorted once,
  appending a new item keeps the list sorted.
  """
  def __init__ ( self, *args, **kwargs ):
    self.Sorted = False
    list.__init__ ( self )
    if isinstance ( args[0], list ) :
      for item in args [0] :
        self.append ( item )
    else :
      self.append ( args[0] )

  def append ( self, value ) :
    list.append ( self, value )
    if self.Sorted :
      self.sort ()

  def sort ( self, *args, **kwargs ) :
    self.Sorted = True
    def _sort ( a, b ) :
      return cmp ( a.lower(), b.lower() )
    return list.sort ( self, _sort )

  def index ( self, value ) :
    value = value.lower()
    for i, item in enumerate ( self ) :
      if item.lower() == value :
        return i
    else :
      return -1

  def __contains__ ( self, value ) :
    return self.index ( value ) >= 0

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