Marks
=====

A :class:`list` of marks corresponding to an exam consists of sublists
of two elements: the student identifier (:class:`str`) and their mark
(:class:`float`). You may suppose that the list is not empty.

Save the following functions into the file :file:`marks.py`:

#. Write the function :py:func:`search_ident` that takes a
   :class:`list` of marks and a student identifier (:class:`str`), and
   returns ``True`` if the given identifier belongs to the list and
   ``False`` otherwise. Examples:
      
   .. literalinclude:: test-marks-1.txt
      :language: python3
      :lines: 3-9
   
   .. note:: 
   
      More tests are provided in the file
      :download:`test-marks-1.txt`.
   

#. Write the function :py:func:`search_mark` that takes a
   :class:`list` and a mark (:class:`float`), and returns ``True`` if
   there is at least one student having this mark and ``False``
   otherwise. Examples:
   
   .. literalinclude:: test-marks-2.txt
      :language: python3
      :lines: 3-9
   
   .. note:: 
   
      More tests are provided in the file
      :download:`test-marks-2.txt`.
   
#. Write the function :py:func:`perc_passed` that takes a
   :class:`list` of marks, and returns the percentage (:class:`float`)
   of students who have passed the exam. Examples:
   
   .. literalinclude:: test-marks-3.txt
      :language: python3
      :lines: 3-11
   
   .. note:: 
   
      More tests are provided in the file
      :download:`test-marks-3.txt`.

#. Write the function :py:func:`best_worst_mark` that takes a
   :class:`list` of marks, and returns the best mark (:class:`float`)
   and the worst mark (:class:`float`) in the list. Examples:
   
   .. literalinclude:: test-marks-4.txt
      :language: python3
      :lines: 3-14
   
   .. note:: 
   
      More tests are provided in the file
      :download:`test-marks-4.txt`.

#. Write the function :py:func:`mark_distribution` that takes a :class:`list`
   of marks, and returns another :class:`list` with 11 items that represents
   the marks distribution between 0 and 10. The first item in the list
   will be the number of marks belonging to the interval [0, 1[; the
   second item will be the number of marks belonging to the interval
   [1, 2[; and so on. The last (11th) item will contain the number of
   marks equal to 10. Examples:
   
   .. literalinclude:: test-marks-5.txt
      :language: python3
      :lines: 3-14

   .. note:: 
   
      More tests are provided in the file
      :download:`test-marks-5.txt`.
   
#. Write the function :py:func:`best_students` that takes a
   :class:`list` of marks, and returns another :class:`list` with the
   identifiers (:class:`str`) of those students whose mark is 10. This
   list must be sorted increasingly. Examples:
   
   .. literalinclude:: test-marks-6.txt
      :language: python3
      :lines: 3-14
   
   .. note:: 
   
      More tests are provided in the file
      :download:`test-marks-6.txt`.
   
#. Write the function :py:func:`sort_ident` that takes a :class:`list` of
   marks, and returns a :class:`list` with the same items sorted by increasing
   identifiers. Examples:
   
   .. literalinclude:: test-marks-7.txt
      :language: python3
      :lines: 3-6
   
   .. note:: 
   
      More tests are provided in the file
      :download:`test-marks-7.txt`.
   
#. Write the function :py:func:`sort_marks` that takes a :class:`list` of
   marks, and returns a :class:`list` with the same items sorted by increasing
   marks firstly and increasing identifiers secondly. Examples:
   
   .. literalinclude:: test-marks-8.txt
      :language: python3
      :lines: 3-
   
   .. note:: 
   
      More tests are provided in the file
      :download:`test-marks-8.txt`.

#. Write the function :py:func:`average` that takes a :class:`list` of
   marks, and returns the average mark (:class:`float`). Examples:
   
   .. literalinclude:: test-marks-9.txt
      :language: python3
      :lines: 3-
   
   .. note:: 
   
      More tests are provided in the file
      :download:`test-marks-9.txt`.

		
.. rubric:: Solution

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