NBA
===
 
The NBA Basketball League rankings are stored in a file where in each
line there is the data concerning a team: team name (:class:`str`),
name of the division where the team plays (:class:`str`) and the
result, separated by the string ``' : '`` (a space, a colon and a
space). The result is represented with the number of games won and
lost (two :class:`int`) separated by a hyphen (``'-'``). For an
example, of this kind of file, see file
:download:`nba.txt<examples/nba.txt>` with the following content:

.. literalinclude:: examples/nba.txt
   :language: console
   :lines: 1-5
	   
Save the following functions into the file ``nba.py``.

#. Write the function :py:func:`good_teams` that given the name of one
   file as the one indicated (:class:`str`) and number (:class:`int`),
   *n*, returns a :class:`list` with the names (:class:`str`) of those
   teams that have won more than *n* games, sorted
   alphabetically. Examples:

   .. literalinclude:: test-good_teams.txt
      :language: python3
      :lines: 3-

   .. note::

      More tests are provided in file :download:`test-good_teams.txt`
  
#. Write the function :py:func:`group` that given the name of a file
   as indicated (:class:`str`), returns a dictionary (:class:`dict`)
   where the key is the division (:class:`str`) and the value the
   (:class:`list`) of those teams (:class:`str`) belonging to that
   division, sorted alphabetically.

   .. literalinclude:: test-group.txt
      :language: python3
      :lines: 3-

   .. note::

      More tests are provided in file :download:`test-group.txt`
  
#. Write the function :py:func:`win` that given the name of a file as
   indicated (:class:`str`) and a division (:class:`str`), returns a
   (:class:`list`) with the teams (:class:`str`) of that division such
   that the number of matches they have won is greater than the number
   of matches they have lost. The elements in this list must be tuples
   (:class:`tuple`) of two elements: team name (:class:`str`) and
   number of won matches (:class:`int`) and have to be sorted in
   decreasing order by the number of won matches.

   .. literalinclude:: test-win.txt
      :language: python3
      :lines: 3-

   .. note::

      More tests are provided in file :download:`test-win.txt`
  

.. rubric:: Solutions

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