freq function

Chris Rebert clp2 at rebertia.com
Sun Aug 22 10:34:33 CEST 2010


On Sun, Aug 22, 2010 at 1:16 AM, Shashwat Anand
<anand.shashwat at gmail.com> wrote:
> On Sun, Aug 22, 2010 at 1:31 PM, Dirk Nachbar <dirknbr at gmail.com> wrote:
>> Here is a function which takes any list and creates a freq table,
>> which can be printed unsorted, sorted by cases or items. It's supposed
>> to mirror the proc freq in SAS.
>>
>> Dirk
>>
<snip>
>>    freq={}
>>    for s in seq:
>>        if s in freq:
>>            freq[s]+=1
>>        else:
>>            freq[s]=1
>
> The above code can be replaced with this:
>  freq = {}
>  for s in seq:
>           freq[s] = freq.get(s,0) + 1

Which can be further replaced by:

from collections import Counter
freq = Counter(seq)

Using collections.defaultdict is another possibility if one doesn't
have Python 2.7.

Cheers,
Chris
--
It really bothers me that Counter isn't a proper Bag.
http://blog.rebertia.com



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