Expand the implementation comments (GH-19699) (GH-19701)
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@ -695,6 +695,13 @@ class Counter(dict):
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#
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#
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# To strip negative and zero counts, add-in an empty counter:
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# To strip negative and zero counts, add-in an empty counter:
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# c += Counter()
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# c += Counter()
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#
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# Rich comparison operators for multiset subset and superset tests
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# are deliberately omitted due to semantic conflicts with the
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# existing inherited dict equality method. Subset and superset
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# semantics ignore zero counts and require that p≤q ∧ p≥q → p=q;
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# however, that would not be the case for p=Counter(a=1, b=0)
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# and q=Counter(a=1) where the dictionaries are not equal.
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def __add__(self, other):
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def __add__(self, other):
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'''Add counts from two counters.
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'''Add counts from two counters.
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