Created
February 7, 2013 21:25
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Python: Count items and sort by incidence
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## {{{ http://code.activestate.com/recipes/52231/ (r1) | |
class Counter: | |
def __init__(self): | |
self.dict = {} | |
def add(self,item): | |
count = self.dict.setdefault(item,0) | |
self.dict[item] = count + 1 | |
def counts(self,desc=None): | |
'''Returns list of keys, sorted by values. | |
Feed a 1 if you want a descending sort.''' | |
i = map(lambda t: list(t),self.dict.items()) | |
map(lambda r: r.reverse(),i) | |
i.sort() | |
if desc: | |
i.reverse() | |
return i | |
if __name__ == '__main__': | |
'''Produces: | |
>>> Ascending count: | |
[[1, 'but'], [1, 'it'], [1, 'not.'], [1, 'now'], [1, 'test,'], [1, 'test.'], [1, 'was'], [2, 'Hello'], [2, 'a'], [2, 'is'], [2, 'there'], [2, 'this']] | |
Descending count: | |
[[2, 'this'], [2, 'there'], [2, 'is'], [2, 'a'], [2, 'Hello'], [1, 'was'], [1, 'test.'], [1, 'test,'], [1, 'now'], [1, 'not.'], [1, 'it'], [1, 'but']] | |
''' | |
sentence = "Hello there this is a test. Hello there this was a test, but now it is not." | |
words = sentence.split() | |
c=Counter() | |
for word in words: | |
c.add(word) | |
print "Ascending count:" | |
print c.counts() | |
print "Descending count:" | |
print c.counts(1) | |
## end of http://code.activestate.com/recipes/52231/ }}} |
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