Python - Filter Tuples with All Even Elements

Python - Filter Tuples with All Even Elements

Filtering tuples based on specific conditions of their elements is a common task in data processing. In this tutorial, we'll guide you through the process of filtering a list of tuples to retain only those that have all even elements.

Objective:

Given:

  • A list of tuples containing integers, say tuples_list.

Return a list containing only the tuples from tuples_list where all elements in the tuple are even.

Implementation:

We'll leverage Python's list comprehensions and the all function to accomplish this:

def filter_even_tuples(tuples_list): # Using list comprehension to filter tuples with all even elements return [t for t in tuples_list if all(element % 2 == 0 for element in t)]

Example Usage:

tuples_list = [(2, 4, 6), (3, 5, 1), (8, 10), (2, 2, 2, 2)] filtered_tuples = filter_even_tuples(tuples_list) print(filtered_tuples) # Output: [(2, 4, 6), (8, 10), (2, 2, 2, 2)]

Explanation:

From the given tuples_list:

  • All elements in the tuple (2, 4, 6) are even.
  • The tuple (3, 5, 1) contains all odd numbers.
  • All elements in the tuple (8, 10) are even.
  • The tuple (2, 2, 2, 2) contains only even numbers.

Therefore, the tuples (2, 4, 6), (8, 10), and (2, 2, 2, 2) meet our criteria.

Deep Dive:

The function filter_even_tuples performs the following operations for each tuple t:

  • For each element in the tuple t, check if element % 2 == 0. This ensures that the element is even.
  • The all function returns True if all elements in the tuple are even and False otherwise.
  • The list comprehension retains the tuple in the result if all elements of the tuple are even.

Conclusion:

Using Python's list comprehensions combined with the all function provides a concise and readable way to filter tuples based on conditions of their elements. The provided method is versatile and can be adapted to other filtering criteria by modifying the condition inside the all function.

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