On 4/25/13, Denis McMahon <denismfmcma...@gmail.com> wrote:
> On Wed, 24 Apr 2013 22:05:52 -0700, CM wrote:
>
>> I have to count the number of various two-digit sequences in a list such
>> as this:
>>
>> mylist = [(2,4), (2,4), (3,4), (4,5), (2,1)] # (Here the (2,4) sequence
>> appears 2 times.)
>>
>> and tally up the results, assigning each to a variable.
...
Consider using the ``collections`` module::
from collections import Counter
mylist = [(2,4), (2,4), (3,4), (4,5), (2,1)]
count = Counter()
for k in mylist:
count[k] += 1
print(count)
# Output looks like this:
# Counter({(2, 4): 2, (4, 5): 1, (3, 4): 1, (2, 1): 1})
You then have access to methods to return the most common items, etc. See more
examples here:
http://docs.python.org/3.3/library/collections.html#collections.Counter
Good luck!
-Modulok-
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