1. Use raw_input to prompt the user for a number and store the number entered 
as a float in a variable named num, and then print the contents of num.

2. For each of the following expressions, what value will the expression give? 
Verify your answers by typing the expressions into Python.
a) True and not False
b) True or True and False c) not True or not False d) True and not 0
e) 52 < 52.3
f) 1+52<52.3 g) 4 != 4.0

3. Write a function named different that has two parameters, a and b. The function 
should return True if a and b refer to different values and should return 
False otherwise.