[Tutor] Looking for duplicates within a list [SOLVED]

[davidheiserca at gmail.com]

How about this?

List = [1, 2, 3, 3, 3, 4, 5, 5]
for Item in list(set(List)):
    print Item, List.count(Item)


  ----- Original Message ----- 
  From: Ken G. 
  To: Steven D'Aprano 
  Cc: tutor at python.org 
  Sent: Friday, June 11, 2010 9:09 AM
  Subject: Re: [Tutor] Looking for duplicates within a list [SOLVED]



  Steven D'Aprano wrote: 
On Sat, 12 Jun 2010 12:58:19 am Alan Gauld wrote:

  Have you looked at the count method of lists?

Something like:

counts = set(( item, mylist.count(item)) for item in mylist if
mylist.count(item) > 1)
    
That's a Shlemiel the Painter algorithm.

http://www.joelonsoftware.com/articles/fog0000000319.html


  Seems to work...
    
You say that now, but one day you will use it on a list of 100,000 
items, and you'll wonder why it takes 45 minutes to finish, and curse 
Python for being slow.
  Hee, hee.  Will investigate further.  Thanks.

Ken


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