Objective Questions

-------------------

.. A mininum of 8 questions here (along with answers)

1. Given the list primes, ``primes = [2, 3, 5, 7, 11, 13, 17, 19, 23,

   29]``, How do you obtain the last 4 primes?

   Answer: primes[-4:]

#. Given the list primes, ``primes = [2, 3, 5, 7, 11, 13, 17, 19, 23,

   29]``, What is the output of ``primes[::5]``?

   Answer: ``[2, 13]``

#. Given a list, p, of unknown length, obtain the first 3 (or all, if

   there are fewer) characters of it. 

   Answer: p[:3]

#. The method ``reverse`` reverses a list in-place. True or False?

   Answer: True

#. ``reversed`` function reverses a list in-place. True or False?

   Answer: False

#. Given the list ``p = [1, 2, 3]``. p[4] produces an IndexError. True

   or False?

   Answer: True

#. Given the list ``p = [1, 2, 3]``. p[:4] produces an IndexError. True

   or False?

   Answer: False

#. Given the list primes, ``primes = [2, 3, 5, 7, 11]``, What is the

   output of ``primes[::-1]``?

   Answer: [11, 7, 5, 3, 2]

#. Given the list primes, ``primes = [2, 3, 5, 7, 11]``, What is the

   output of ``primes[::-3]``?

   Answer: [11, 3]

Larger Questions

----------------

.. A minimum of 2 questions here (along with answers)

#. Given a list p. Append it's reverse to itself. 

   Answer::

      p = p + reversed(p)

#. Marks is a list containing the roll numbers of students followed by

   marks. [This is not a recommended way to hold the marks details,

   but the teacher knows only so much Python!] Now she wants to get

   the average of the marks. Help her do it. 

   Answer::

     marks = [1, 9, 2, 8, 3, 3, 4, 10, 5, 2]

     average = sum(marks[1::2])/len(marks[1::2])