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Update example: Counter.subtract returns None, not self

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Andrew Svetlov 2012-12-17 14:01:29 +02:00
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Doc/library/collections.rst
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@ -279,6 +279,7 @@ For example::
>>> c = Counter(a=4, b=2, c=0, d=-2)
>>> d = Counter(a=1, b=2, c=3, d=4)
>>> c.subtract(d)
>>> c
Counter({'a': 3, 'b': 0, 'c': -3, 'd': -6})
.. versionadded:: 3.2