[Tutor] Re: Unique Items in Lists

[Kent Johnson]

Brian van den Broek wrote:
> Wolfram Kraus said unto the world upon 2005-01-27 03:24:
> 
>> Brian van den Broek wrote:

>>>     for key in items_dict.copy():   # Try it without the .copy()
>>>         if items_dict[key] == 1:    # and see what happens.
>>>             del items_dict[key]
>>>
>>>     dict_keys = items_dict.keys()
>>>     dict_keys.sort()
>>
>>
>>>     for key in dict_keys:
>>>         print '%s occurred %s times' %(key, items_dict[key])
>>
>>
>> This whole part can be rewritten (without sorting, but in Py2.4 you 
>> can use sorted() for this) with a list comprehension (Old Python2.1 
>> style, with a newer version the keys() aren't needed):
>>       for k,v in [(k, items_dict[k]) \
>>       for k in items_dict.keys() if items_dict[k] > 1]:
>>           print '%s occurred %s times' %(key, items_dict[key])

I think it is clearer to filter the list as it is printed. And dict.iteritems() is handy here, too.

for k, v in items_dict.iteritems():
   if v > 1:
     print '%s occurred %s times' % (k, v)

Kent