Assignment 1
Write a python function named cube which computes the cube of a given number n. 

Assignment 2
 Write a python function named avg which computes the average of a and b. 

Assignment 3
Add docstring to the function f. 

Assignment 4
Write a python function named circle which returns the area and perimeter of a circle given radius r. 

Assignment 5
What will the function do?
 def what(x)
     return x*x
- Returns the square of x
- Returns x
- Function doesn't have docstring
- Error

How many arguments can be passed to a python function?

        None
        One
        Two
        Any

    Write a function which calculates the area of a rectangle.