Python | Custom Index Range Summation

Python | Custom Index Range Summation

In this tutorial, we'll create a function that calculates the sum of elements within a custom index range in a list.

Problem: Given a list of numbers and two indices start and end, compute the sum of the numbers between these indices (inclusive).

Example: For the list [1, 2, 3, 4, 5] and indices start=1, end=3, the resulting sum would be: 2 + 3 + 4 = 9.

Step-by-Step Approach:

  1. Access the sublist from the input list using slicing.
  2. Use Python's built-in sum function to compute the total of the sublist.

Python: Custom Index Range Summation

def custom_range_sum(numbers, start, end): # Get the sublist using slicing and compute its sum return sum(numbers[start:end+1]) # Example usage: lst = [1, 2, 3, 4, 5] start_index = 1 end_index = 3 print(custom_range_sum(lst, start_index, end_index)) # Outputs: 9

Explanation:

  • We use list slicing to extract the sublist between the given indices. Remember that list slicing is start-inclusive and end-exclusive, so we add 1 to the end index to include the end index in the slice.
  • After extracting the sublist, we simply pass it to the sum function which returns the total of the elements.

This custom_range_sum function provides a quick way to compute the sum of elements within a specific index range of a list. The approach can be extended or adapted for other operations, such as computing the product, finding the maximum, etc., within a given range.

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