Python | K occurrence element Test

Python | K occurrence element Test

In this tutorial, we'll explore how to test if an element occurs exactly k times in a list.

Problem Statement:

Given a list and a value, determine if the value occurs exactly k times in the list.

Approach:

  1. Use the count() method of lists to count the occurrences of the given value.
  2. Check if this count is equal to k.

Python Code:

def k_occurrence_test(lst, value, k): """ Check if a value occurs k times in the list. :param lst: List[int] - List of numbers :param value: int - Value to check :param k: int - Desired occurrence count :return: bool - True if value occurs k times, otherwise False """ # Count occurrences of the value in the list occurrences = lst.count(value) # Return True if occurrences equal k, otherwise False return occurrences == k # Example usage: lst = [1, 2, 3, 4, 2, 5, 2, 6] value = 2 k = 3 print(k_occurrence_test(lst, value, k)) # Output: True value = 5 k = 2 print(k_occurrence_test(lst, value, k)) # Output: False

Explanation:

  1. The function k_occurrence_test takes a list lst, an integer value value, and an integer k as arguments.
  2. The function uses the count() method to count how many times the given value appears in the list.
  3. The function then compares this count with k to determine if value appears exactly k times in the list.
  4. The function returns True if the count matches k, and False otherwise.

This method provides an efficient and straightforward way to check if a value occurs exactly k times in a list in Python.

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