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Tweak the docs for Counter() objects.

This commit is contained in:
Raymond Hettinger 2009-02-04 11:31:30 +00:00
parent 8184f5a46c
commit 939a3cc5a2
1 changed files with 4 additions and 4 deletions
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8
Doc/library/collections.rst
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@ -156,14 +156,14 @@ Notes on using :class:`Set` and :class:`MutableSet` as a mixin:
A counter tool is provided to support convenient and rapid tallies. A counter tool is provided to support convenient and rapid tallies.
For example:: For example::
# Tally occurrences of words in a list >>> # Tally occurrences of words in a list
>>> cnt = Counter() >>> cnt = Counter()
>>> for word in ['red', 'blue', 'red', 'green', 'blue', 'blue']: >>> for word in ['red', 'blue', 'red', 'green', 'blue', 'blue']:
... cnt[word] += 1 ... cnt[word] += 1
>>> cnt >>> cnt
Counter({'blue': 3, 'red': 2, 'green': 1}) Counter({'blue': 3, 'red': 2, 'green': 1})
# Find the ten most common words in Hamlet >>> # Find the ten most common words in Hamlet
>>> import re >>> import re
>>> words = re.findall('\w+', open('hamlet.txt').read().lower()) >>> words = re.findall('\w+', open('hamlet.txt').read().lower())
>>> Counter(words).most_common(10) >>> Counter(words).most_common(10)
@ -256,8 +256,8 @@ Several multiset mathematical operations are provided for combining
contain repeated elements (with counts of one or more). Addition and contain repeated elements (with counts of one or more). Addition and
subtraction combine counters by adding or subtracting the counts of subtraction combine counters by adding or subtracting the counts of
corresponding elements. Intersection and union return the minimum and maximum corresponding elements. Intersection and union return the minimum and maximum
of corresponding counts. All four multiset operations exclude results with of corresponding counts. Each operation can accept inputs with signed counts,
counts less than one:: but the output excludes results with counts less than one.
>>> c = Counter(a=3, b=1) >>> c = Counter(a=3, b=1)
>>> d = Counter(a=1, b=2) >>> d = Counter(a=1, b=2)