Python program to swap two variables

Description: Write a Python program to swap the values of two variables.

Rules and hints:

• Do it first with a third (temporary) variable.
• Then do it the Python way, in one line.

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Python program to swap two variables

a = 10
b = 20
print("Before swap: a =", a, "b =", b)

a, b = b, a

print("After swap: a =", a, "b =", b)

Output:

How it works

• The line a, b = b, a builds a tuple (b, a) and unpacks it into a and b.
• In many other languages you need a third variable: temp = a, a = b, b = temp. That also works in Python.
• Swapping works with any type, not only numbers.

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