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Groups > comp.lang.python > #44334

Re: Pythonic way to count sequences

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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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Thread

Pythonic way to count sequences CM <cmpython@gmail.com> - 2013-04-24 22:05 -0700
  Re: Pythonic way to count sequences Chris Angelico <rosuav@gmail.com> - 2013-04-25 15:26 +1000
    Re: Pythonic way to count sequences CM <cmpython@gmail.com> - 2013-04-25 19:40 -0700
  Re: Pythonic way to count sequences Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-04-25 06:14 +0000
  Re: Pythonic way to count sequences Serhiy Storchaka <storchaka@gmail.com> - 2013-04-25 15:36 +0300
  Re: Pythonic way to count sequences Denis McMahon <denismfmcmahon@gmail.com> - 2013-04-25 23:29 +0000
    Re: Pythonic way to count sequences Modulok <modulok@gmail.com> - 2013-04-25 19:16 -0600
    Re: Pythonic way to count sequences Matthew Gilson <m.gilson1@gmail.com> - 2013-04-25 22:40 -0400

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