Python Coding Challange - Question with Answer (01020525)

Step-by-step Breakdown

nums = [100, 200, 300, 400]

A list of 4 integers is defined.

range(len(nums)-1, -1, -2)

This expands to:

range(3, -1, -2)

• len(nums) - 1 = 4 - 1 = 3 → Start at index 3 (last element)

• -1 is the stop (not inclusive), so it goes until index 0

• -2 is the step → go backwards by 2 steps each time

Iteration over range(3, -1, -2):

• i = 3 → nums[3] = 400

• i = 1 → nums[1] = 200

Loop stops before reaching -1.

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Output

400
200

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 Summary

• The code iterates in reverse, skipping every second element.

• It accesses and prints nums[3], then nums[1].

Application of Python Libraries for Civil Engineering

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