Exchange the value of the two variable which is already exist is called swapping.
Example -
Before swapping
a=10
b=20
After swapping
a=20
b=10
program-
print("Enter first number")
a=input()
print("Enter second number")
b=input()
print("Before swapping -")
print(a,b)
a,b=b,a
print("After swapping -")
print(a,b)
Enter first number
3
Enter second number
4
Before swapping -
3 4
After swapping -
4 3
Enter first number
@
Enter second number
#
Before swapping -
@ #
After swapping -
# @