You want to swap the values of two variables a and b without using a temporary variable. Which of the following is the correct way in Python?

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Python - Variables and Dynamic Typing

You want to swap the values of two variables a and b without using a temporary variable. Which of the following is the correct way in Python?

Aa = a + b; b = a - b

Ba = b; b = a

Ca, b = b, a

Da = b; b = a + b

Step-by-Step Solution

Solution:

Step 1: Understand Python tuple unpacking
Python allows swapping variables in one line using tuple unpacking: a, b = b, a.
Step 2: Check other options
a = b; b = a assigns b to a, then a to b, which results in both having b's value. a = a + b; b = a - b performs the first two steps of an arithmetic swap but misses the last step, leaving a as the sum. a = b; b = a + b is incorrect and changes values incorrectly.
Final Answer:
a, b = b, a -> Option C
Quick Check:
Swap variables easily with a, b = b, a [OK]

Quick Trick: Swap variables with a, b = b, a [OK]

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