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frequencies python Code Snippet in 2023

listintermediate

Last Updated: 28 January 2023

Creates a dictionary with the unique values of a list as keys and their frequencies as the values.

  • Use collections.defaultdict() to store the frequencies of each unique element.
  • Use dict() to return a dictionary with the unique elements of the list as keys and their frequencies as the values.
from collections import defaultdict def frequencies(lst): freq = defaultdict(int) for val in lst: freq[val] += 1 return dict(freq)
frequencies(['a', 'b', 'a', 'c', 'a', 'a', 'b']) # { 'a': 4, 'b': 2, 'c': 1 }

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