Web Reference: Test your understanding of Python's Counter class from the collections module, including construction, counting, and multiset operations. Sometimes you need to count the objects in a given data source to know how often they occur. In other words, you need to determine their frequency. Mar 11, 2026 · Counter is a subclass of Python’s dict from the collections module. It is mainly used to count the frequency of elements in an iterable (like lists, strings or tuples) or from a mapping (dictionary). Python's Counter is a subclass of the dictionary data type for counting hashable objects by creating a dictionary where the iterable's elements are stored as keys, and their counts are stored as values. In other words, the Counter's constructor function takes an iterable object, and returns a dictionary containing the frequency of each item in the ...
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