Python Program to Swap Two Elements in a List

In this article, we will explore various methods to swap two elements in a list in Python.

Using Multiple Assignment

a = [10, 20, 30, 40, 50]
a[0], a[4] = a[4], a[0]

print(a)

[50, 20, 30, 40, 10]

Explanation: a[0], a[4] = a[4], a[0]: swaps the first (a[0]) and last (a[4]) elements of the list.

Using XOR Operator

We can swap two numbers without requiring a temporary variable by using the XOR operator (^). It works because applying XOR twice with the same value brings back the original number.

a = 5
b = 10

a = a ^ b
b = a ^ b
a = a ^ b

print(a, b)

10 5

Explanation:

• a = a ^ b: stores the XOR of a and b in a.
• b = a ^ b: effectively assigns the original value of a to b.
• a = a ^ b: assigns the original value of b to a.

Using a Temporary Variable

a = [10, 20, 30, 40, 50]

temp = a[2]
a[2] = a[4]
a[4] = temp
print(a)

[10, 20, 50, 40, 30]

Explanation:

• We store the value at index 2 (30) in a temporary variable temp.
• We then assign the value at index 4 (50) to index 2.
• Finally, we assign the value stored in temp (30) to index 4.

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