Reviewed by Aditya Kumar · Last reviewed 2026-08-08
To reverse the order of words in a string, the most Pythonic approach involves splitting the string into a list of words, reversing that list, and then joining the words back into a string. This…
This medium-level Python/Coding question appears frequently in data engineering interviews at companies like Incedo. While less common, it tests deeper understanding that distinguishes strong candidates. Mastering the underlying concepts (join, python) will help you answer variations of this question confidently.
Break this problem into components. Identify the core trade-offs involved, then walk the interviewer through your reasoning step by step. Demonstrate awareness of edge cases and production considerations - this is what separates good answers from great ones. The expert answer includes a code example that demonstrates the implementation pattern.
To reverse the order of words in a string, the most Pythonic approach involves splitting the string into a list of words, reversing that list, and then joining the words back into a string. This method effectively handles multiple spaces between words by collapsing them.
The solution leverages a combination of Python's string and list methods:
s.split(): When called without arguments, str.split() divides the string by any sequence of whitespace characters (spaces, tabs, newlines). Crucially, it discards empty strings, meaning multiple spaces between words are treated as a single delimiter, and leading/trailing whitespace is removed. This returns a list of words.[::-1]: This is Python's extended slice notation for reversing a sequence (in this case, the list of words). It creates a new list with the elements in reverse order.' '.join(...): This string method concatenates the elements of an iterable (our reversed list of words) into a single string. The string it's called on (here, a single space ' ') acts as the delimiter between the joined elements.def reverse_words(s: str) -> str:
return ' '.join(s.split()[::-1])
The s.split() method, while convenient, has specific behaviors that are important to understand:
Multiple Spaces: It collapses any sequence of whitespace into a single space during the re-join, and removes leading/trailing spaces. If the requirement is to strictly preserve all* original whitespace (e.
Red Flag: Using s.reverse() on split (in-place, returns None). Pro-Move: 'split()[::-1] is O(n)—we use for log line reversal in parser.'
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