Title

Double elements of a list with specific indices stored in another list

What will you learn?

In this tutorial, you will master the technique of doubling the elements of a list at designated indices based on another provided list. This process involves iterating through specific indices and updating the corresponding elements in the original list.

Introduction to Problem and Solution

Imagine having a list of numbers and a separate list containing specific indices. Your task is to enhance your Python skills by learning how to double the elements in the original list only at those specified indices. By understanding this problem, you will gain insights into efficient manipulation of lists in Python.

Code

# Given original_list and index_list, double elements at specified indices
original_list = [1, 2, 3, 4, 5]
index_list = [1, 3]

for idx in index_list:
    if idx < len(original_list):
        original_list[idx] *= 2

# Print modified original_list
print(original_list)

# Copyright PHD

Explanation

To solve this problem effectively: – Iterate through each index in index_list. – Check if the index is within bounds of original_list. – Double the value at that index in original_list.

How does the program handle out-of-bound indices?

If an index from index_list exceeds the length of original_list, it will be ignored without causing errors due to boundary checking.

Can I have duplicate indices in my index list?

Yes, you can include duplicate values in your index list. The program will double all occurrences of those indices.

What happens if my lists are empty?

If either or both lists are empty, no modifications will be made as there are no elements or indices to work with.

Will this code work for negative indices?

No, this code assumes non-negative integer values for indexing into lists. Negative values may not behave as expected here.

Is there a way to modify multiple positions simultaneously instead of one by one?

Yes, you can adjust multiple positions simultaneously by extending our logic or using advanced techniques like List Comprehensions.

Conclusion

By mastering how to manipulate specific elements within a list based on corresponding indices stored elsewhere with PythonHelpDesk.com, you enhance your proficiency in handling collections efficiently while programming with Python.