Pythonic way to count sequences
Serhiy Storchaka
storchaka at gmail.com
Thu Apr 25 08:36:47 EDT 2013
25.04.13 08:26, Chris Angelico написав(ла):
> So you can count them up directly with a dictionary:
>
> count = {}
> for sequence_tuple in list_of_tuples:
> count[sequence_tuple] = count.get(sequence_tuple,0) + 1
Or alternatives:
count = {}
for sequence_tuple in list_of_tuples:
if sequence_tuple] in count:
count[sequence_tuple] += 1
else:
count[sequence_tuple] = 1
count = {}
for sequence_tuple in list_of_tuples:
try:
count[sequence_tuple] += 1
except KeyError:
count[sequence_tuple] = 1
import collections
count = collections.defaultdict(int)
for sequence_tuple in list_of_tuples:
count[sequence_tuple] += 1
But of course collections.Counter is a preferable way now.
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