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You want to swap the values of two variables a and b in Python. Which of the following is the correct way to do it?

hard📝 Application Q15 of 15
Python - Variables and Dynamic Typing
You want to swap the values of two variables a and b in Python. Which of the following is the correct way to do it?
Aa, b = b, a
Ba = b b = a
Ctemp = a b = temp a = b
Da = a + b b = a - b a = a - b
Step-by-Step Solution
Solution:

  1. Step 1: Understand swapping variables

    Swapping means exchanging values so that a gets b's value and b gets a's value.

  2. Step 2: Analyze each option

    a = b b = a assigns b to a, then a to b, losing original a. temp = a b = temp a = b incorrectly assigns b before a. a = a + b b = a - b a = a - b uses arithmetic swap which works but is less clear and can cause errors with non-numbers. a, b = b, a uses Python's tuple unpacking to swap values correctly and clearly.

  3. Final Answer:

    a, b = b, a -> Option A

  4. Quick Check:

    Use tuple unpacking for swap [OK]
Quick Trick: Swap with a, b = b, a for clean code [OK]
Common Mistakes:
MISTAKES
  • Overwriting variables before swapping
  • Using temporary variable incorrectly
  • Using arithmetic swap with non-numbers

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