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A Counter turns a sequence of values into a defaultdict(int)-like object mappingkeys to counts:

Question

A Counter turns a sequence of values into a defaultdict(int)-like object mapping keys to counts:

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Solution

The statement you provided is about Python's Counter class, which is a part of the collections module. The Counter class in Python is used to count the frequency of elements in a list, tuple, dictionary, string, which are all iterable objects.

Here's a step-by-step explanation:

  1. Import the Counter class from the collections module.
from collections import Counter
  1. Create a list of elements.
elements = ['apple', 'banana', 'apple', 'orange', 'banana', 'banana']
  1. Pass the list to the Counter class, which returns a dictionary-like object with elements as keys and their counts as values.
counter = Counter(elements)
  1. Print the counter.
print(counter)

This will output:

Counter({'banana': 3, 'apple': 2, 'orange': 1})

This shows that 'banana' appears 3 times, 'apple' 2 times, and 'orange' 1 time in the list.

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