Counter 1.0.0

Counter is a Python module created to define the counter.Counter class similar to multisets or bags in other languages.

Installation

pip install Counter

or:

easy_install Counter

or:

git clone git://github.com/KelSolaar/Counter.git
python setup.py install

Usage

- Tally occurrences of words in a list:

 >>> cnt = Counter()
 >>> for word in ['red', 'blue', 'red', 'green', 'blue', 'blue']:
 ... cnt[word] += 1
 >>> cnt
 Counter({'blue': 3, 'red': 2, 'green': 1})

- Find the ten most common words in Hamlet:

 >>> import re
 >>> words = re.findall('\w+', open('hamlet.txt').read().lower())
 >>> Counter(hamlet_words).most_common(10)
 [('the', 1143), ('and', 966), ('to', 762), ('of', 669), ('i', 631),
 ('you', 554), ('a', 546), ('my', 514), ('hamlet', 471), ('in', 451)]

- Multiset examples:

 >>> c = Counter(a=3, b=1)
 >>> d = Counter(a=1, b=2)
 >>> c + d # add two counters together: c[x] + d[x]
 Counter({'a': 4, 'b': 3})
 >>> c - d # subtract (keeping only positive counts)
 Counter({'a': 2})
 >>> c & d # intersection: min(c[x], d[x])
 Counter({'a': 1, 'b': 1})
 >>> c | d # union: max(c[x], d[x])
 Counter({'a': 3, 'b': 2})


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Requirements:

· Python