Which of the following Python code snippets correctly swaps the values of two variables, a and b?1 pointa = b b = atemp = a a = b b = tempa, b = b, aswap(a, b)

To determine which Python code snippet correctly swaps the values of two variables a and b, let’s analyze the given options.

Breakdown of the Options

1. Option 1:

   a = b
   b = a
   

   • This does not swap the values; instead, it assigns b to a, and then a to b, which means both a and b end up with the same value as b.

2. Option 2:

   temp = a
   a = b
   b = temp
   

   • This is a classic method to swap values. Here, we store the value of a in a temporary variable temp, assign b to a, and then assign temp (which holds the original value of a) to b. This correctly swaps the values.

3. Option 3:

   a, b = b, a
   

   • This is Python's tuple unpacking feature. It effectively swaps a and b in one line, making it another correct method to swap these variables.

4. Option 4:

   swap(a, b)
   

   • This is not a recognized syntax for swapping values in Python unless swap is a defined function. Therefore, it will raise a NameError unless the function is implemented correctly elsewhere.

Analysis and Conclusion

Based on the analysis of each option, Option 2 and Option 3 are correct ways to swap the values of a and b in Python:

• Option 2 utilizes a temporary variable for swapping.
• Option 3 uses Python's tuple unpacking for a clean and concise swap.

Final Answer

The following snippets correctly swap the values of a and b:

• temp = a
  a = b
  b = temp
  

• a, b = b, a