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Re: Dictionaries and incrementing keys

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Steve Crook wrote:

> I've always done key creation/incrementation using:
> 
> if key in dict:
>     dict[key] += 1
> else:
>     dict[key] = 1

Your way is usually faster than
 
> dict[key] = dict.get(key, 0) + 1
> 
> Whilst certainly more compact, I'd be interested in views on how
> pythonesque this method is.

You may also consider

http://docs.python.org/library/collections.html#collections.defaultdict
http://docs.python.org/library/collections.html#collections.Counter

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Dictionaries and incrementing keys Steve Crook <steve@mixmin.net> - 2011-06-14 10:57 +0000
  Re: Dictionaries and incrementing keys Peter Otten <__peter__@web.de> - 2011-06-14 13:16 +0200
    Re: Dictionaries and incrementing keys AlienBaby <matt.j.warren@gmail.com> - 2011-06-14 05:37 -0700
      Re: Dictionaries and incrementing keys Steve Crook <steve@mixmin.net> - 2011-06-14 12:53 +0000
        Re: Dictionaries and incrementing keys Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-06-14 13:26 +0000
    Re: Dictionaries and incrementing keys Steve Crook <steve@mixmin.net> - 2011-06-14 12:57 +0000
  Re: Dictionaries and incrementing keys Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-06-14 13:24 +0000
  Re: Dictionaries and incrementing keys Asen Bozhilov <asen.bozhilov@gmail.com> - 2011-06-14 09:30 -0700
  Re: Dictionaries and incrementing keys Raymond Hettinger <python@rcn.com> - 2011-06-25 01:13 -0700

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