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Counting characters in string (See related posts)

>>> s = 'a;jfkd;aflhakfhaskfjalghlakfhfnkjafyksd'
>>> cnt = {}
>>> for c in s:
	cnt[c] = cnt.get(c,0) + 1

>>> print cnt
{'a': 7, 'd': 2, 'g': 1, 'f': 7, 'h': 4, 'k': 6, 'j': 3, 'l': 3, 'n': 1, 's': 2, 'y': 1, ';': 2}

This can be used to count any distribution.
Note the use of dict.get(key,default) to set to 0
if the key is not avaiable.
If this were perl, I would just do a
cnt[c] += 1

But python will give an error instead of returning 0.
It's not too bad, though.
to python count dictionary default by korakot on Tue Jul 26 14:39:46 -0400 2005

Comments on this post

foudhos posts on Sep 06, 2005 at 17:47
>>> s = 'a;jfkd;aflhakfhaskfjalghlakfhfnkjafyksd'
>>> dict((c, s.count(c)) for c in s)
{'a': 7, 'd': 2, 'g': 1, 'f': 7, 'h': 4, 'k': 6, 'j': 3, 'l': 3, 'n': 1, 's': 2, 'y': 1, ';': 2}

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