Exercise

1. Text file practice

   Write a module containing two functions. When run, the module should prompt the user for a filename and a number of lines (let's refer to it as n) and then call each function in turn with these parameters.

   a. The function head should return a list containing the first n lines of the file.

   b. The function tail should return a list containing the last n lines of the file.

   Make a test at the bottom to show the output of running the module, it might look like this:

    Name of file to test with: pooh.txt
    Number of lines to display: 3

    head says the first 3 lines are:
    The more it snows
      (Tiddely pom),
    The more it goes

    tail says the last 3 lines are:
     How cold my toes
      (Tiddely pom),
     Are growing.

Since the file could be very long you will not want to read the whole thing into memory as a list of lines... Here is a short file to test with pooh.txt