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MyASPN >> Mail Archive >> python-Tutor
python-Tutor
Re: [Tutor] Detecting different list elements and counting them
by Alan Gauld other posts by this author
Dec 11 2003 7:39PM messages near this date
[Tutor] Detecting different list elements and counting them | Re: [Tutor] Detecting different list elements and counting them
>  my_list = [ 'ABC', 'E', 'ABC', 'ABC', 'HJ', 'HJ' ]
> 
>  It would be nice to have the information which elements are in
the list
>  and how many times these elements appear in the list.
> 
>  A dictionary as the result like the following would be fine.
> 
>  my_dict = {'ABC':3, 'E':1, 'HJ':2}

You just answered your own question, coz that's exactly what to
do.

my_dict = {}
for item in my_list:
    if item in my_dict:
       my_dict[item] += 1
    else: my_dict[item] = 1

There might be a slightly cleverer way to do it using
my_dict(get)
but I can't be bothered thinking about it... :-)

Alan g.


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