Pensions
========

The expenses of a group of pensioners are stored in a list of sublists
where each sublist represents a pensioner's data and it consists of
the identifier (ID) of the pensioner (string), an integer that
indicates the age and some recorded monthly expenses (integers). In
the following example, the first sublist stands for a pensioner with
ID '1111A' who is 68 years old and three monthly expenses of 640, 589
and 573.

.. code:: python

    [['1111A', 68, 640, 589, 573], ['2222D', 69, 710, 550, 570, 698, 645, 512]]
	
Save all functions into the same file named :file:`pensions.py`.

#. Write the function :py:func:`expense_average` that given a list of
   pensioners returns another list with the average monthly expense of
   each pensioner. The list must be sorted increasingly.

   .. literalinclude:: pensions1.txt
      :language: python3
      :lines: 3-

   .. note::

      More tests are provided in file :download:`pensions1.txt<pensions1.txt>`.

#. Write the function :py:func:`exp_averag_sup` that takes a list of
   pensioners and an expense, ``d`` (float), and returns another list with
   two elements: ID and age of the first pensioner that has an average
   expense greater than ``d``. If there is any such pensioner, the
   function must return an empty list.

   .. literalinclude:: pensions2.txt
      :language: python3
      :lines: 3-

   .. note::

         More tests are provided in file :download:`pensions2.txt<pensions2.txt>`.

#. Write the function :py:func:`exp_sup` that takes a list of
   pensioners and an expense, ``d`` (float), and returns another list
   with the ID of those pensioners with one or more of their monthly
   expenses superior to ``d``.  IDs in the new list must appear in the
   same order than in the original list. If there are any such
   pensioners, the function must return an empty list.

   .. literalinclude:: pensions3.txt
      :language: python3
      :lines: 3-

   .. note::
         More tests are provided in file :download:`pensions3.txt<pensions3.txt>`.

#. Write the function :py:func:`no_reach` that takes a list of
   pensioners and an expense, ``d`` (float), and returns the ID of the
   first pensioner that has an expense superior to ``d``. If there is any
   such pensioner, the function must return an empty string.

   .. literalinclude:: pensions4.txt
      :language: python3
      :lines: 3-

   .. note::
        More tests are provided in file :download:`pensions4.txt<pensions4.txt>`.

#. Write the modifier function :py:func:`put_average` that given a
   list of pensioners, modifies this list adding at the end of each
   sublist the average expense.

   .. literalinclude:: pensions5.txt
      :language: python3
      :lines: 3-

   .. note::
        More tests are provided in file :download:`pensions5.txt<pensions5.txt>`.

.. rubric::  Solution

A solution of these functions is provided in file :download:`pensions.py <solutions/pensions.py>`