Service company (4 points)
==========================

A service company offers different types of services as maintenance, cleaning, safety, repair, etc. It manages a daily services file with the following data: worker id (:py:class:`str`), service type (:py:class:`str`), shift (:py:class:`str`), arrival time (:py:class:`int`), i. e. time it takes for the worker to get to the place that needs the service, service duration (:py:class:`int`) and a :py:class:`bool` that indicates whether this service was urgent or not. Times are expressed in minutes. Example:

.. literalinclude:: servicesC.txt
   :language: text
   :lines: 18 - 21, 43-44 

Download the following example files, needed for the tests: :download:`servicesA.txt`, :download:`servicesB.txt`, :download:`servicesC.txt`.

This company wants to solve the next problems with three Python functions that must be saved to the same file ``service.py``:

1. Classify urgent services by service type (1.5 points).
   
   Write function :py:func:`service1` that takes the name of a file
   (:py:class:`str`) as described, and returns a dictionary
   (:py:class:`dict`) corresponding to urgent services. The key of the
   dictionary is the service type and the value is a :py:class:`list`
   with the arrival times of those services of this type that were
   urgent. These lists must be in the same order as in the given
   file. Example:

   .. literalinclude:: test-service1.txt
      :language: python
      :lines: 3 - 7

   .. note:: You have more tests in file :download:`test-service1.txt`

2. Obtain the service type with larger average arrival times (1 point).

   Write function :py:func:`service2` that takes a dictionary
   (:py:class:`dict`) as the one returned by :py:func:`service1`. This
   function must compute the average of the arrival times for each
   service type and must return a :py:class:`tuple` with two
   elements. The first one is the service type with the maximum
   computed average of arrival times (:py:class:`str`) and the second
   one is this maximum average of arrival times
   (:py:class:`float`). You can consider that this maximum is unique
   and that the dictionary is not empty. Example:

   .. literalinclude:: test-service2.txt
      :language: python
      :lines: 3 - 10 

   .. note:: You have more tests in file :download:`test-service2.txt`
	     
3. Obtain a file with data corresponding to a specific service type
   (1.5 points).
   
   Write function :py:func:`service3` that takes the name of a file
   (:py:class:`str`) as the one described in the first paragraph, and
   a service type (:py:class:`str`), and creates another file
   corresponding to the given service type. The name of this file
   is the name of the service type followed by the extension
   ``'.txt'``. Each line of this file has three data fields: the
   worker id, the shift and the total time (arrival plus duration) for
   this service (:py:class:`int`), separated by a space. Example:
 
   .. literalinclude:: test-service3.txt
      :language: python
      :lines: 3 - 13

   .. note:: You have more tests in file :download:`test-service3.txt`

.. hint:: Remember to use functions ``int`` and ``str`` to decode and encode integer values.