Swapping values

Given two variables a and b, write a Python program that allows the user to enter two values for them, swap their values and display them on the screen. The execution of the program should result in the following:

>>> %Run
    Enter the value of the variable a: 4
    Enter the value of the variable b: 2
    The value of a is 2
    The value of b is 4

Assuming that 4 and 2 are the values entered by the user. This should work for any pair of user-entered values.

Execute tests through the console and check the output. Does your program work for negative numbers? Does it work for strings? Does it work for characters? Does it work for reals? Can a and b have different types? Should your program work for all these cases?

This exercise was TILEd by adding the last paragraph. We explicitly
ask the students to test for different types of values. Most
students, because of the example execution convert the user input to
int, but that is not necessary for the swapping, anything can be
swappped. Asking them to test with all kinds of values makes them
aware of the assumptions they made when reading the exercises and
hence how testing is good to find errors.