Dataford
Interview QuestionsInterview GuidesExperiencesMock InterviewsPricing
Get started

Swap Two Numbers in Python

EasyPython00:00
Practice interviewer
In session
5 left
00:00

Your question is Swap Two Numbers in Python. Start with the requirements on the right.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

You need to log in / sign up to run or submit.

Problem

DXC Technology engineers often write small Python utilities that transform values before passing them between application services. Implement a function that swaps two integer values without changing either input variable outside the function.

Formal Specification

Given two integers a and b, return a two-element list containing the values in swapped order. The first output element must be the original value of b, and the second must be the original value of a.

Do not perform arithmetic-based swapping, such as addition and subtraction. Use Python's assignment features or another clear constant-space technique.

Constraints

  • a and b are integers.
  • -10^9 <= a, b <= 10^9
  • The function must use O(1) auxiliary space.
  • Return exactly two values in a list.

Function Signature

def swap_numbers(a, b):
Your solutionPython 3
You need to log in / sign up to run or submit.
Run your code to see test output