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Tag · 3 snippets

#grouping

Bucket items by a key.

count_by(items, key)Count how many items map to each key, using collections.Counter.O(n)3.11+
group_by(items, key)Bucket items into lists keyed by a function, keeping the original order inside each group.O(n)3.11+
collect_dictionary(d)Invert a dict so each value maps to the list of keys that had it.O(n)3.11+